KafkaConfig.scala

/**
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

package kafka.server

import java.util
import java.util.{Collections, Locale, Properties}

import kafka.api.{ApiVersion, ApiVersionValidator, KAFKA_0_10_0_IV1, KAFKA_2_1_IV0, KAFKA_2_7_IV0, KAFKA_2_8_IV0}
import kafka.cluster.EndPoint
import kafka.coordinator.group.OffsetConfig
import kafka.coordinator.transaction.{TransactionLog, TransactionStateManager}
import kafka.log.LogConfig
import kafka.message.{BrokerCompressionCodec, CompressionCodec, ZStdCompressionCodec}
import kafka.security.authorizer.AuthorizerUtils
import kafka.server.KafkaRaftServer.{BrokerRole, ControllerRole, ProcessRole}
import kafka.utils.CoreUtils
import kafka.utils.Implicits._
import org.apache.kafka.clients.CommonClientConfigs
import org.apache.kafka.common.Reconfigurable
import org.apache.kafka.common.config.{AbstractConfig, ConfigDef, ConfigException, ConfigResource, SaslConfigs, SecurityConfig, SslClientAuth, SslConfigs, TopicConfig}
import org.apache.kafka.common.config.ConfigDef.{ConfigKey, ValidList}
import org.apache.kafka.common.config.internals.BrokerSecurityConfigs
import org.apache.kafka.common.config.types.Password
import org.apache.kafka.common.metrics.Sensor
import org.apache.kafka.common.network.ListenerName
import org.apache.kafka.common.record.{LegacyRecord, Records, TimestampType}
import org.apache.kafka.common.security.auth.SecurityProtocol
import org.apache.kafka.common.utils.Utils
import org.apache.kafka.raft.RaftConfig
import org.apache.kafka.server.authorizer.Authorizer
import org.apache.zookeeper.client.ZKClientConfig

import scala.jdk.CollectionConverters._
import scala.collection.{Map, Seq}

object Defaults {
  /** ********* Zookeeper Configuration ***********/
  val ZkSessionTimeoutMs = 18000
  val ZkSyncTimeMs = 2000
  val ZkEnableSecureAcls = false
  val ZkMaxInFlightRequests = 10
  val ZkSslClientEnable = false
  val ZkSslProtocol = "TLSv1.2"
  val ZkSslEndpointIdentificationAlgorithm = "HTTPS"
  val ZkSslCrlEnable = false
  val ZkSslOcspEnable = false

  /** ********* General Configuration ***********/
  val BrokerIdGenerationEnable = true
  val MaxReservedBrokerId = 1000
  val BrokerId = -1
  val MessageMaxBytes = 1024 * 1024 + Records.LOG_OVERHEAD
  val NumNetworkThreads = 3
  val NumIoThreads = 8
  val BackgroundThreads = 10
  val QueuedMaxRequests = 500
  val QueuedMaxRequestBytes = -1
  val InitialBrokerRegistrationTimeoutMs = 60000
  val BrokerHeartbeatIntervalMs = 2000
  val BrokerSessionTimeoutMs = 9000

  /** KRaft mode configs */
  val EmptyNodeId: Int = -1

  /************* Authorizer Configuration ***********/
  val AuthorizerClassName = ""

  /** ********* Socket Server Configuration ***********/
  val Port = 9092
  val HostName: String = new String("")

  val ListenerSecurityProtocolMap: String = EndPoint.DefaultSecurityProtocolMap.map { case (listenerName, securityProtocol) =>
    s"${listenerName.value}:${securityProtocol.name}"
  }.mkString(",")

  val SocketSendBufferBytes: Int = 100 * 1024
  val SocketReceiveBufferBytes: Int = 100 * 1024
  val SocketRequestMaxBytes: Int = 100 * 1024 * 1024
  val MaxConnectionsPerIp: Int = Int.MaxValue
  val MaxConnectionsPerIpOverrides: String = ""
  val MaxConnections: Int = Int.MaxValue
  val MaxConnectionCreationRate: Int = Int.MaxValue
  val ConnectionsMaxIdleMs = 10 * 60 * 1000L
  val RequestTimeoutMs = 30000
  val ConnectionSetupTimeoutMs = CommonClientConfigs.DEFAULT_SOCKET_CONNECTION_SETUP_TIMEOUT_MS
  val ConnectionSetupTimeoutMaxMs = CommonClientConfigs.DEFAULT_SOCKET_CONNECTION_SETUP_TIMEOUT_MAX_MS
  val FailedAuthenticationDelayMs = 100

  /** ********* Log Configuration ***********/
  val NumPartitions = 1
  val LogDir = "/tmp/kafka-logs"
  val LogSegmentBytes = 1 * 1024 * 1024 * 1024
  val LogRollHours = 24 * 7
  val LogRollJitterHours = 0
  val LogRetentionHours = 24 * 7

  val LogRetentionBytes = -1L
  val LogCleanupIntervalMs = 5 * 60 * 1000L
  val Delete = "delete"
  val Compact = "compact"
  val LogCleanupPolicy = Delete
  val LogCleanerThreads = 1
  val LogCleanerIoMaxBytesPerSecond = Double.MaxValue
  val LogCleanerDedupeBufferSize = 128 * 1024 * 1024L
  val LogCleanerIoBufferSize = 512 * 1024
  val LogCleanerDedupeBufferLoadFactor = 0.9d
  val LogCleanerBackoffMs = 15 * 1000
  val LogCleanerMinCleanRatio = 0.5d
  val LogCleanerEnable = true
  val LogCleanerDeleteRetentionMs = 24 * 60 * 60 * 1000L
  val LogCleanerMinCompactionLagMs = 0L
  val LogCleanerMaxCompactionLagMs = Long.MaxValue
  val LogIndexSizeMaxBytes = 10 * 1024 * 1024
  val LogIndexIntervalBytes = 4096
  val LogFlushIntervalMessages = Long.MaxValue
  val LogDeleteDelayMs = 60000
  val LogFlushSchedulerIntervalMs = Long.MaxValue
  val LogFlushOffsetCheckpointIntervalMs = 60000
  val LogFlushStartOffsetCheckpointIntervalMs = 60000
  val LogPreAllocateEnable = false
  // lazy val as `InterBrokerProtocolVersion` is defined later
  lazy val LogMessageFormatVersion = InterBrokerProtocolVersion
  val LogMessageTimestampType = "CreateTime"
  val LogMessageTimestampDifferenceMaxMs = Long.MaxValue
  val NumRecoveryThreadsPerDataDir = 1
  val AutoCreateTopicsEnable = true
  val MinInSyncReplicas = 1
  val MessageDownConversionEnable = true

  /** ********* Replication configuration ***********/
  val ControllerSocketTimeoutMs = RequestTimeoutMs
  val ControllerMessageQueueSize = Int.MaxValue
  val DefaultReplicationFactor = 1
  val ReplicaLagTimeMaxMs = 30000L
  val ReplicaSocketTimeoutMs = 30 * 1000
  val ReplicaSocketReceiveBufferBytes = 64 * 1024
  val ReplicaFetchMaxBytes = 1024 * 1024
  val ReplicaFetchWaitMaxMs = 500
  val ReplicaFetchMinBytes = 1
  val ReplicaFetchResponseMaxBytes = 10 * 1024 * 1024
  val NumReplicaFetchers = 1
  val ReplicaFetchBackoffMs = 1000
  val ReplicaHighWatermarkCheckpointIntervalMs = 5000L
  val FetchPurgatoryPurgeIntervalRequests = 1000
  val ProducerPurgatoryPurgeIntervalRequests = 1000
  val DeleteRecordsPurgatoryPurgeIntervalRequests = 1
  val AutoLeaderRebalanceEnable = true
  val LeaderImbalancePerBrokerPercentage = 10
  val LeaderImbalanceCheckIntervalSeconds = 300
  val UncleanLeaderElectionEnable = false
  val InterBrokerSecurityProtocol = SecurityProtocol.PLAINTEXT.toString
  val InterBrokerProtocolVersion = ApiVersion.latestVersion.toString

  /** ********* Controlled shutdown configuration ***********/
  val ControlledShutdownMaxRetries = 3
  val ControlledShutdownRetryBackoffMs = 5000
  val ControlledShutdownEnable = true

  /** ********* Group coordinator configuration ***********/
  val GroupMinSessionTimeoutMs = 6000
  val GroupMaxSessionTimeoutMs = 1800000
  val GroupInitialRebalanceDelayMs = 3000
  val GroupMaxSize: Int = Int.MaxValue

  /** ********* Offset management configuration ***********/
  val OffsetMetadataMaxSize = OffsetConfig.DefaultMaxMetadataSize
  val OffsetsLoadBufferSize = OffsetConfig.DefaultLoadBufferSize
  val OffsetsTopicReplicationFactor = OffsetConfig.DefaultOffsetsTopicReplicationFactor
  val OffsetsTopicPartitions: Int = OffsetConfig.DefaultOffsetsTopicNumPartitions
  val OffsetsTopicSegmentBytes: Int = OffsetConfig.DefaultOffsetsTopicSegmentBytes
  val OffsetsTopicCompressionCodec: Int = OffsetConfig.DefaultOffsetsTopicCompressionCodec.codec
  val OffsetsRetentionMinutes: Int = 7 * 24 * 60
  val OffsetsRetentionCheckIntervalMs: Long = OffsetConfig.DefaultOffsetsRetentionCheckIntervalMs
  val OffsetCommitTimeoutMs = OffsetConfig.DefaultOffsetCommitTimeoutMs
  val OffsetCommitRequiredAcks = OffsetConfig.DefaultOffsetCommitRequiredAcks

  /** ********* Transaction management configuration ***********/
  val TransactionalIdExpirationMs = TransactionStateManager.DefaultTransactionalIdExpirationMs
  val TransactionsMaxTimeoutMs = TransactionStateManager.DefaultTransactionsMaxTimeoutMs
  val TransactionsTopicMinISR = TransactionLog.DefaultMinInSyncReplicas
  val TransactionsLoadBufferSize = TransactionLog.DefaultLoadBufferSize
  val TransactionsTopicReplicationFactor = TransactionLog.DefaultReplicationFactor
  val TransactionsTopicPartitions = TransactionLog.DefaultNumPartitions
  val TransactionsTopicSegmentBytes = TransactionLog.DefaultSegmentBytes
  val TransactionsAbortTimedOutTransactionsCleanupIntervalMS = TransactionStateManager.DefaultAbortTimedOutTransactionsIntervalMs
  val TransactionsRemoveExpiredTransactionsCleanupIntervalMS = TransactionStateManager.DefaultRemoveExpiredTransactionalIdsIntervalMs

  /** ********* Fetch Configuration **************/
  val MaxIncrementalFetchSessionCacheSlots = 1000
  val FetchMaxBytes = 55 * 1024 * 1024

  /** ********* Quota Configuration ***********/
  val ProducerQuotaBytesPerSecondDefault = ClientQuotaManagerConfig.QuotaDefault
  val ConsumerQuotaBytesPerSecondDefault = ClientQuotaManagerConfig.QuotaDefault
  val NumQuotaSamples: Int = ClientQuotaManagerConfig.DefaultNumQuotaSamples
  val QuotaWindowSizeSeconds: Int = ClientQuotaManagerConfig.DefaultQuotaWindowSizeSeconds
  val NumReplicationQuotaSamples: Int = ReplicationQuotaManagerConfig.DefaultNumQuotaSamples
  val ReplicationQuotaWindowSizeSeconds: Int = ReplicationQuotaManagerConfig.DefaultQuotaWindowSizeSeconds
  val NumAlterLogDirsReplicationQuotaSamples: Int = ReplicationQuotaManagerConfig.DefaultNumQuotaSamples
  val AlterLogDirsReplicationQuotaWindowSizeSeconds: Int = ReplicationQuotaManagerConfig.DefaultQuotaWindowSizeSeconds
  val NumControllerQuotaSamples: Int = ClientQuotaManagerConfig.DefaultNumQuotaSamples
  val ControllerQuotaWindowSizeSeconds: Int = ClientQuotaManagerConfig.DefaultQuotaWindowSizeSeconds

  /** ********* Transaction Configuration ***********/
  val TransactionalIdExpirationMsDefault = 604800000

  val DeleteTopicEnable = true

  val CompressionType = "producer"

  val MaxIdMapSnapshots = 2
  /** ********* Kafka Metrics Configuration ***********/
  val MetricNumSamples = 2
  val MetricSampleWindowMs = 30000
  val MetricReporterClasses = ""
  val MetricRecordingLevel = Sensor.RecordingLevel.INFO.toString()


  /** ********* Kafka Yammer Metrics Reporter Configuration ***********/
  val KafkaMetricReporterClasses = ""
  val KafkaMetricsPollingIntervalSeconds = 10

  /** ********* SSL configuration ***********/
  val SslProtocol = SslConfigs.DEFAULT_SSL_PROTOCOL
  val SslEnabledProtocols = SslConfigs.DEFAULT_SSL_ENABLED_PROTOCOLS
  val SslKeystoreType = SslConfigs.DEFAULT_SSL_KEYSTORE_TYPE
  val SslTruststoreType = SslConfigs.DEFAULT_SSL_TRUSTSTORE_TYPE
  val SslKeyManagerAlgorithm = SslConfigs.DEFAULT_SSL_KEYMANGER_ALGORITHM
  val SslTrustManagerAlgorithm = SslConfigs.DEFAULT_SSL_TRUSTMANAGER_ALGORITHM
  val SslEndpointIdentificationAlgorithm = SslConfigs.DEFAULT_SSL_ENDPOINT_IDENTIFICATION_ALGORITHM
  val SslClientAuthentication = SslClientAuth.NONE.name().toLowerCase(Locale.ROOT)
  val SslClientAuthenticationValidValues = SslClientAuth.VALUES.asScala.map(v => v.toString().toLowerCase(Locale.ROOT)).asJava.toArray(new Array[String](0))
  val SslPrincipalMappingRules = BrokerSecurityConfigs.DEFAULT_SSL_PRINCIPAL_MAPPING_RULES

    /** ********* General Security configuration ***********/
  val ConnectionsMaxReauthMsDefault = 0L

  /** ********* Sasl configuration ***********/
  val SaslMechanismInterBrokerProtocol = SaslConfigs.DEFAULT_SASL_MECHANISM
  val SaslEnabledMechanisms = BrokerSecurityConfigs.DEFAULT_SASL_ENABLED_MECHANISMS
  val SaslKerberosKinitCmd = SaslConfigs.DEFAULT_KERBEROS_KINIT_CMD
  val SaslKerberosTicketRenewWindowFactor = SaslConfigs.DEFAULT_KERBEROS_TICKET_RENEW_WINDOW_FACTOR
  val SaslKerberosTicketRenewJitter = SaslConfigs.DEFAULT_KERBEROS_TICKET_RENEW_JITTER
  val SaslKerberosMinTimeBeforeRelogin = SaslConfigs.DEFAULT_KERBEROS_MIN_TIME_BEFORE_RELOGIN
  val SaslKerberosPrincipalToLocalRules = BrokerSecurityConfigs.DEFAULT_SASL_KERBEROS_PRINCIPAL_TO_LOCAL_RULES
  val SaslLoginRefreshWindowFactor = SaslConfigs.DEFAULT_LOGIN_REFRESH_WINDOW_FACTOR
  val SaslLoginRefreshWindowJitter = SaslConfigs.DEFAULT_LOGIN_REFRESH_WINDOW_JITTER
  val SaslLoginRefreshMinPeriodSeconds = SaslConfigs.DEFAULT_LOGIN_REFRESH_MIN_PERIOD_SECONDS
  val SaslLoginRefreshBufferSeconds = SaslConfigs.DEFAULT_LOGIN_REFRESH_BUFFER_SECONDS

  /** ********* Delegation Token configuration ***********/
  val DelegationTokenMaxLifeTimeMsDefault = 7 * 24 * 60 * 60 * 1000L
  val DelegationTokenExpiryTimeMsDefault = 24 * 60 * 60 * 1000L
  val DelegationTokenExpiryCheckIntervalMsDefault = 1 * 60 * 60 * 1000L

  /** ********* Password encryption configuration for dynamic configs *********/
  val PasswordEncoderCipherAlgorithm = "AES/CBC/PKCS5Padding"
  val PasswordEncoderKeyLength = 128
  val PasswordEncoderIterations = 4096

  /** ********* Raft Quorum Configuration *********/
  val QuorumVoters = RaftConfig.DEFAULT_QUORUM_VOTERS
  val QuorumElectionTimeoutMs = RaftConfig.DEFAULT_QUORUM_ELECTION_TIMEOUT_MS
  val QuorumFetchTimeoutMs = RaftConfig.DEFAULT_QUORUM_FETCH_TIMEOUT_MS
  val QuorumElectionBackoffMs = RaftConfig.DEFAULT_QUORUM_ELECTION_BACKOFF_MAX_MS
  val QuorumLingerMs = RaftConfig.DEFAULT_QUORUM_LINGER_MS
  val QuorumRequestTimeoutMs = RaftConfig.DEFAULT_QUORUM_REQUEST_TIMEOUT_MS
  val QuorumRetryBackoffMs = RaftConfig.DEFAULT_QUORUM_RETRY_BACKOFF_MS
}

object KafkaConfig {

  private val LogConfigPrefix = "log."

  def main(args: Array[String]): Unit = {
    System.out.println(configDef.toHtml(4, (config: String) => "brokerconfigs_" + config,
      DynamicBrokerConfig.dynamicConfigUpdateModes))
  }

  /** ********* Zookeeper Configuration ***********/
  val ZkConnectProp = "zookeeper.connect"
  val ZkSessionTimeoutMsProp = "zookeeper.session.timeout.ms"
  val ZkConnectionTimeoutMsProp = "zookeeper.connection.timeout.ms"
  val ZkSyncTimeMsProp = "zookeeper.sync.time.ms"
  val ZkEnableSecureAclsProp = "zookeeper.set.acl"
  val ZkMaxInFlightRequestsProp = "zookeeper.max.in.flight.requests"
  val ZkSslClientEnableProp = "zookeeper.ssl.client.enable"
  val ZkClientCnxnSocketProp = "zookeeper.clientCnxnSocket"
  val ZkSslKeyStoreLocationProp = "zookeeper.ssl.keystore.location"
  val ZkSslKeyStorePasswordProp = "zookeeper.ssl.keystore.password"
  val ZkSslKeyStoreTypeProp = "zookeeper.ssl.keystore.type"
  val ZkSslTrustStoreLocationProp = "zookeeper.ssl.truststore.location"
  val ZkSslTrustStorePasswordProp = "zookeeper.ssl.truststore.password"
  val ZkSslTrustStoreTypeProp = "zookeeper.ssl.truststore.type"
  val ZkSslProtocolProp = "zookeeper.ssl.protocol"
  val ZkSslEnabledProtocolsProp = "zookeeper.ssl.enabled.protocols"
  val ZkSslCipherSuitesProp = "zookeeper.ssl.cipher.suites"
  val ZkSslEndpointIdentificationAlgorithmProp = "zookeeper.ssl.endpoint.identification.algorithm"
  val ZkSslCrlEnableProp = "zookeeper.ssl.crl.enable"
  val ZkSslOcspEnableProp = "zookeeper.ssl.ocsp.enable"

  // a map from the Kafka config to the corresponding ZooKeeper Java system property
  private[kafka] val ZkSslConfigToSystemPropertyMap: Map[String, String] = Map(
    ZkSslClientEnableProp -> ZKClientConfig.SECURE_CLIENT,
    ZkClientCnxnSocketProp -> ZKClientConfig.ZOOKEEPER_CLIENT_CNXN_SOCKET,
    ZkSslKeyStoreLocationProp -> "zookeeper.ssl.keyStore.location",
    ZkSslKeyStorePasswordProp -> "zookeeper.ssl.keyStore.password",
    ZkSslKeyStoreTypeProp -> "zookeeper.ssl.keyStore.type",
    ZkSslTrustStoreLocationProp -> "zookeeper.ssl.trustStore.location",
    ZkSslTrustStorePasswordProp -> "zookeeper.ssl.trustStore.password",
    ZkSslTrustStoreTypeProp -> "zookeeper.ssl.trustStore.type",
    ZkSslProtocolProp -> "zookeeper.ssl.protocol",
    ZkSslEnabledProtocolsProp -> "zookeeper.ssl.enabledProtocols",
    ZkSslCipherSuitesProp -> "zookeeper.ssl.ciphersuites",
    ZkSslEndpointIdentificationAlgorithmProp -> "zookeeper.ssl.hostnameVerification",
    ZkSslCrlEnableProp -> "zookeeper.ssl.crl",
    ZkSslOcspEnableProp -> "zookeeper.ssl.ocsp")

  private[kafka] def getZooKeeperClientProperty(clientConfig: ZKClientConfig, kafkaPropName: String): Option[String] = {
    Option(clientConfig.getProperty(ZkSslConfigToSystemPropertyMap(kafkaPropName)))
  }

  private[kafka] def setZooKeeperClientProperty(clientConfig: ZKClientConfig, kafkaPropName: String, kafkaPropValue: Any): Unit = {
    clientConfig.setProperty(ZkSslConfigToSystemPropertyMap(kafkaPropName),
      kafkaPropName match {
        case ZkSslEndpointIdentificationAlgorithmProp => (kafkaPropValue.toString.toUpperCase == "HTTPS").toString
        case ZkSslEnabledProtocolsProp | ZkSslCipherSuitesProp => kafkaPropValue match {
          case list: java.util.List[_] => list.asInstanceOf[java.util.List[_]].asScala.mkString(",")
          case _ => kafkaPropValue.toString
        }
        case _ => kafkaPropValue.toString
    })
  }

  // For ZooKeeper TLS client authentication to be enabled the client must (at a minimum) configure itself as using TLS
  // with both a client connection socket and a key store location explicitly set.
  private[kafka] def zkTlsClientAuthEnabled(zkClientConfig: ZKClientConfig) = {
    getZooKeeperClientProperty(zkClientConfig, ZkSslClientEnableProp).getOrElse("false") == "true" &&
      getZooKeeperClientProperty(zkClientConfig, ZkClientCnxnSocketProp).isDefined &&
      getZooKeeperClientProperty(zkClientConfig, ZkSslKeyStoreLocationProp).isDefined
  }

  /** ********* General Configuration ***********/
  val BrokerIdGenerationEnableProp = "broker.id.generation.enable"
  val MaxReservedBrokerIdProp = "reserved.broker.max.id"
  val BrokerIdProp = "broker.id"
  val MessageMaxBytesProp = "message.max.bytes"
  val NumNetworkThreadsProp = "num.network.threads"
  val NumIoThreadsProp = "num.io.threads"
  val BackgroundThreadsProp = "background.threads"
  val NumReplicaAlterLogDirsThreadsProp = "num.replica.alter.log.dirs.threads"
  val QueuedMaxRequestsProp = "queued.max.requests"
  val QueuedMaxBytesProp = "queued.max.request.bytes"
  val RequestTimeoutMsProp = CommonClientConfigs.REQUEST_TIMEOUT_MS_CONFIG
  val ConnectionSetupTimeoutMsProp = CommonClientConfigs.SOCKET_CONNECTION_SETUP_TIMEOUT_MS_CONFIG
  val ConnectionSetupTimeoutMaxMsProp = CommonClientConfigs.SOCKET_CONNECTION_SETUP_TIMEOUT_MAX_MS_CONFIG

  /** KRaft mode configs */
  val ProcessRolesProp = "process.roles"
  val InitialBrokerRegistrationTimeoutMsProp = "initial.broker.registration.timeout.ms"
  val BrokerHeartbeatIntervalMsProp = "broker.heartbeat.interval.ms"
  val BrokerSessionTimeoutMsProp = "broker.session.timeout.ms"
  val NodeIdProp = "node.id"
  val MetadataLogDirProp = "metadata.log.dir"
  val ControllerListenerNamesProp = "controller.listener.names"
  val SaslMechanismControllerProtocolProp = "sasl.mechanism.controller.protocol"

  /************* Authorizer Configuration ***********/
  val AuthorizerClassNameProp = "authorizer.class.name"
  /** ********* Socket Server Configuration ***********/
  val PortProp = "port"
  val HostNameProp = "host.name"
  val ListenersProp = "listeners"
  val AdvertisedHostNameProp: String = "advertised.host.name"
  val AdvertisedPortProp = "advertised.port"
  val AdvertisedListenersProp = "advertised.listeners"
  val ListenerSecurityProtocolMapProp = "listener.security.protocol.map"
  val ControlPlaneListenerNameProp = "control.plane.listener.name"
  val SocketSendBufferBytesProp = "socket.send.buffer.bytes"
  val SocketReceiveBufferBytesProp = "socket.receive.buffer.bytes"
  val SocketRequestMaxBytesProp = "socket.request.max.bytes"
  val MaxConnectionsPerIpProp = "max.connections.per.ip"
  val MaxConnectionsPerIpOverridesProp = "max.connections.per.ip.overrides"
  val MaxConnectionsProp = "max.connections"
  val MaxConnectionCreationRateProp = "max.connection.creation.rate"
  val ConnectionsMaxIdleMsProp = "connections.max.idle.ms"
  val FailedAuthenticationDelayMsProp = "connection.failed.authentication.delay.ms"
  /***************** rack configuration *************/
  val RackProp = "broker.rack"
  /** ********* Log Configuration ***********/
  val NumPartitionsProp = "num.partitions"
  val LogDirsProp = "log.dirs"
  val LogDirProp = "log.dir"
  val LogSegmentBytesProp = "log.segment.bytes"

  val LogRollTimeMillisProp = "log.roll.ms"
  val LogRollTimeHoursProp = "log.roll.hours"

  val LogRollTimeJitterMillisProp = "log.roll.jitter.ms"
  val LogRollTimeJitterHoursProp = "log.roll.jitter.hours"

  val LogRetentionTimeMillisProp = "log.retention.ms"
  val LogRetentionTimeMinutesProp = "log.retention.minutes"
  val LogRetentionTimeHoursProp = "log.retention.hours"

  val LogRetentionBytesProp = "log.retention.bytes"
  val LogCleanupIntervalMsProp = "log.retention.check.interval.ms"
  val LogCleanupPolicyProp = "log.cleanup.policy"
  val LogCleanerThreadsProp = "log.cleaner.threads"
  val LogCleanerIoMaxBytesPerSecondProp = "log.cleaner.io.max.bytes.per.second"
  val LogCleanerDedupeBufferSizeProp = "log.cleaner.dedupe.buffer.size"
  val LogCleanerIoBufferSizeProp = "log.cleaner.io.buffer.size"
  val LogCleanerDedupeBufferLoadFactorProp = "log.cleaner.io.buffer.load.factor"
  val LogCleanerBackoffMsProp = "log.cleaner.backoff.ms"
  val LogCleanerMinCleanRatioProp = "log.cleaner.min.cleanable.ratio"
  val LogCleanerEnableProp = "log.cleaner.enable"
  val LogCleanerDeleteRetentionMsProp = "log.cleaner.delete.retention.ms"
  val LogCleanerMinCompactionLagMsProp = "log.cleaner.min.compaction.lag.ms"
  val LogCleanerMaxCompactionLagMsProp = "log.cleaner.max.compaction.lag.ms"
  val LogIndexSizeMaxBytesProp = "log.index.size.max.bytes"
  val LogIndexIntervalBytesProp = "log.index.interval.bytes"
  val LogFlushIntervalMessagesProp = "log.flush.interval.messages"
  val LogDeleteDelayMsProp = "log.segment.delete.delay.ms"
  val LogFlushSchedulerIntervalMsProp = "log.flush.scheduler.interval.ms"
  val LogFlushIntervalMsProp = "log.flush.interval.ms"
  val LogFlushOffsetCheckpointIntervalMsProp = "log.flush.offset.checkpoint.interval.ms"
  val LogFlushStartOffsetCheckpointIntervalMsProp = "log.flush.start.offset.checkpoint.interval.ms"
  val LogPreAllocateProp = "log.preallocate"
  val LogMessageFormatVersionProp = LogConfigPrefix + "message.format.version"
  val LogMessageTimestampTypeProp = LogConfigPrefix + "message.timestamp.type"
  val LogMessageTimestampDifferenceMaxMsProp = LogConfigPrefix + "message.timestamp.difference.max.ms"
  val LogMaxIdMapSnapshotsProp = LogConfigPrefix + "max.id.map.snapshots"
  val NumRecoveryThreadsPerDataDirProp = "num.recovery.threads.per.data.dir"
  val AutoCreateTopicsEnableProp = "auto.create.topics.enable"
  val MinInSyncReplicasProp = "min.insync.replicas"
  val CreateTopicPolicyClassNameProp = "create.topic.policy.class.name"
  val AlterConfigPolicyClassNameProp = "alter.config.policy.class.name"
  val LogMessageDownConversionEnableProp = LogConfigPrefix + "message.downconversion.enable"
  /** ********* Replication configuration ***********/
  val ControllerSocketTimeoutMsProp = "controller.socket.timeout.ms"
  val DefaultReplicationFactorProp = "default.replication.factor"
  val ReplicaLagTimeMaxMsProp = "replica.lag.time.max.ms"
  val ReplicaSocketTimeoutMsProp = "replica.socket.timeout.ms"
  val ReplicaSocketReceiveBufferBytesProp = "replica.socket.receive.buffer.bytes"
  val ReplicaFetchMaxBytesProp = "replica.fetch.max.bytes"
  val ReplicaFetchWaitMaxMsProp = "replica.fetch.wait.max.ms"
  val ReplicaFetchMinBytesProp = "replica.fetch.min.bytes"
  val ReplicaFetchResponseMaxBytesProp = "replica.fetch.response.max.bytes"
  val ReplicaFetchBackoffMsProp = "replica.fetch.backoff.ms"
  val NumReplicaFetchersProp = "num.replica.fetchers"
  val ReplicaHighWatermarkCheckpointIntervalMsProp = "replica.high.watermark.checkpoint.interval.ms"
  val FetchPurgatoryPurgeIntervalRequestsProp = "fetch.purgatory.purge.interval.requests"
  val ProducerPurgatoryPurgeIntervalRequestsProp = "producer.purgatory.purge.interval.requests"
  val DeleteRecordsPurgatoryPurgeIntervalRequestsProp = "delete.records.purgatory.purge.interval.requests"
  val AutoLeaderRebalanceEnableProp = "auto.leader.rebalance.enable"
  val LeaderImbalancePerBrokerPercentageProp = "leader.imbalance.per.broker.percentage"
  val LeaderImbalanceCheckIntervalSecondsProp = "leader.imbalance.check.interval.seconds"
  val UncleanLeaderElectionEnableProp = "unclean.leader.election.enable"
  val InterBrokerSecurityProtocolProp = "security.inter.broker.protocol"
  val InterBrokerProtocolVersionProp = "inter.broker.protocol.version"
  val InterBrokerListenerNameProp = "inter.broker.listener.name"
  val ReplicaSelectorClassProp = "replica.selector.class"
  /** ********* Controlled shutdown configuration ***********/
  val ControlledShutdownMaxRetriesProp = "controlled.shutdown.max.retries"
  val ControlledShutdownRetryBackoffMsProp = "controlled.shutdown.retry.backoff.ms"
  val ControlledShutdownEnableProp = "controlled.shutdown.enable"
  /** ********* Group coordinator configuration ***********/
  val GroupMinSessionTimeoutMsProp = "group.min.session.timeout.ms"
  val GroupMaxSessionTimeoutMsProp = "group.max.session.timeout.ms"
  val GroupInitialRebalanceDelayMsProp = "group.initial.rebalance.delay.ms"
  val GroupMaxSizeProp = "group.max.size"
  /** ********* Offset management configuration ***********/
  val OffsetMetadataMaxSizeProp = "offset.metadata.max.bytes"
  val OffsetsLoadBufferSizeProp = "offsets.load.buffer.size"
  val OffsetsTopicReplicationFactorProp = "offsets.topic.replication.factor"
  val OffsetsTopicPartitionsProp = "offsets.topic.num.partitions"
  val OffsetsTopicSegmentBytesProp = "offsets.topic.segment.bytes"
  val OffsetsTopicCompressionCodecProp = "offsets.topic.compression.codec"
  val OffsetsRetentionMinutesProp = "offsets.retention.minutes"
  val OffsetsRetentionCheckIntervalMsProp = "offsets.retention.check.interval.ms"
  val OffsetCommitTimeoutMsProp = "offsets.commit.timeout.ms"
  val OffsetCommitRequiredAcksProp = "offsets.commit.required.acks"
  /** ********* Transaction management configuration ***********/
  val TransactionalIdExpirationMsProp = "transactional.id.expiration.ms"
  val TransactionsMaxTimeoutMsProp = "transaction.max.timeout.ms"
  val TransactionsTopicMinISRProp = "transaction.state.log.min.isr"
  val TransactionsLoadBufferSizeProp = "transaction.state.log.load.buffer.size"
  val TransactionsTopicPartitionsProp = "transaction.state.log.num.partitions"
  val TransactionsTopicSegmentBytesProp = "transaction.state.log.segment.bytes"
  val TransactionsTopicReplicationFactorProp = "transaction.state.log.replication.factor"
  val TransactionsAbortTimedOutTransactionCleanupIntervalMsProp = "transaction.abort.timed.out.transaction.cleanup.interval.ms"
  val TransactionsRemoveExpiredTransactionalIdCleanupIntervalMsProp = "transaction.remove.expired.transaction.cleanup.interval.ms"

  /** ********* Fetch Configuration **************/
  val MaxIncrementalFetchSessionCacheSlots = "max.incremental.fetch.session.cache.slots"
  val FetchMaxBytes = "fetch.max.bytes"

  /** ********* Quota Configuration ***********/
  val ProducerQuotaBytesPerSecondDefaultProp = "quota.producer.default"
  val ConsumerQuotaBytesPerSecondDefaultProp = "quota.consumer.default"
  val NumQuotaSamplesProp = "quota.window.num"
  val NumReplicationQuotaSamplesProp = "replication.quota.window.num"
  val NumAlterLogDirsReplicationQuotaSamplesProp = "alter.log.dirs.replication.quota.window.num"
  val NumControllerQuotaSamplesProp = "controller.quota.window.num"
  val QuotaWindowSizeSecondsProp = "quota.window.size.seconds"
  val ReplicationQuotaWindowSizeSecondsProp = "replication.quota.window.size.seconds"
  val AlterLogDirsReplicationQuotaWindowSizeSecondsProp = "alter.log.dirs.replication.quota.window.size.seconds"
  val ControllerQuotaWindowSizeSecondsProp = "controller.quota.window.size.seconds"
  val ClientQuotaCallbackClassProp = "client.quota.callback.class"

  val DeleteTopicEnableProp = "delete.topic.enable"
  val CompressionTypeProp = "compression.type"

  /** ********* Kafka Metrics Configuration ***********/
  val MetricSampleWindowMsProp = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_CONFIG
  val MetricNumSamplesProp: String = CommonClientConfigs.METRICS_NUM_SAMPLES_CONFIG
  val MetricReporterClassesProp: String = CommonClientConfigs.METRIC_REPORTER_CLASSES_CONFIG
  val MetricRecordingLevelProp: String = CommonClientConfigs.METRICS_RECORDING_LEVEL_CONFIG

  /** ********* Kafka Yammer Metrics Reporters Configuration ***********/
  val KafkaMetricsReporterClassesProp = "kafka.metrics.reporters"
  val KafkaMetricsPollingIntervalSecondsProp = "kafka.metrics.polling.interval.secs"

  /** ******** Common Security Configuration *************/
  val PrincipalBuilderClassProp = BrokerSecurityConfigs.PRINCIPAL_BUILDER_CLASS_CONFIG
  val ConnectionsMaxReauthMsProp = BrokerSecurityConfigs.CONNECTIONS_MAX_REAUTH_MS
  val securityProviderClassProp = SecurityConfig.SECURITY_PROVIDERS_CONFIG

  /** ********* SSL Configuration ****************/
  val SslProtocolProp = SslConfigs.SSL_PROTOCOL_CONFIG
  val SslProviderProp = SslConfigs.SSL_PROVIDER_CONFIG
  val SslCipherSuitesProp = SslConfigs.SSL_CIPHER_SUITES_CONFIG
  val SslEnabledProtocolsProp = SslConfigs.SSL_ENABLED_PROTOCOLS_CONFIG
  val SslKeystoreTypeProp = SslConfigs.SSL_KEYSTORE_TYPE_CONFIG
  val SslKeystoreLocationProp = SslConfigs.SSL_KEYSTORE_LOCATION_CONFIG
  val SslKeystorePasswordProp = SslConfigs.SSL_KEYSTORE_PASSWORD_CONFIG
  val SslKeyPasswordProp = SslConfigs.SSL_KEY_PASSWORD_CONFIG
  val SslKeystoreKeyProp = SslConfigs.SSL_KEYSTORE_KEY_CONFIG
  val SslKeystoreCertificateChainProp = SslConfigs.SSL_KEYSTORE_CERTIFICATE_CHAIN_CONFIG
  val SslTruststoreTypeProp = SslConfigs.SSL_TRUSTSTORE_TYPE_CONFIG
  val SslTruststoreLocationProp = SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG
  val SslTruststorePasswordProp = SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG
  val SslTruststoreCertificatesProp = SslConfigs.SSL_TRUSTSTORE_CERTIFICATES_CONFIG
  val SslKeyManagerAlgorithmProp = SslConfigs.SSL_KEYMANAGER_ALGORITHM_CONFIG
  val SslTrustManagerAlgorithmProp = SslConfigs.SSL_TRUSTMANAGER_ALGORITHM_CONFIG
  val SslEndpointIdentificationAlgorithmProp = SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_CONFIG
  val SslSecureRandomImplementationProp = SslConfigs.SSL_SECURE_RANDOM_IMPLEMENTATION_CONFIG
  val SslClientAuthProp = BrokerSecurityConfigs.SSL_CLIENT_AUTH_CONFIG
  val SslPrincipalMappingRulesProp = BrokerSecurityConfigs.SSL_PRINCIPAL_MAPPING_RULES_CONFIG
  var SslEngineFactoryClassProp = SslConfigs.SSL_ENGINE_FACTORY_CLASS_CONFIG

  /** ********* SASL Configuration ****************/
  val SaslMechanismInterBrokerProtocolProp = "sasl.mechanism.inter.broker.protocol"
  val SaslJaasConfigProp = SaslConfigs.SASL_JAAS_CONFIG
  val SaslEnabledMechanismsProp = BrokerSecurityConfigs.SASL_ENABLED_MECHANISMS_CONFIG
  val SaslServerCallbackHandlerClassProp = BrokerSecurityConfigs.SASL_SERVER_CALLBACK_HANDLER_CLASS
  val SaslClientCallbackHandlerClassProp = SaslConfigs.SASL_CLIENT_CALLBACK_HANDLER_CLASS
  val SaslLoginClassProp = SaslConfigs.SASL_LOGIN_CLASS
  val SaslLoginCallbackHandlerClassProp = SaslConfigs.SASL_LOGIN_CALLBACK_HANDLER_CLASS
  val SaslKerberosServiceNameProp = SaslConfigs.SASL_KERBEROS_SERVICE_NAME
  val SaslKerberosKinitCmdProp = SaslConfigs.SASL_KERBEROS_KINIT_CMD
  val SaslKerberosTicketRenewWindowFactorProp = SaslConfigs.SASL_KERBEROS_TICKET_RENEW_WINDOW_FACTOR
  val SaslKerberosTicketRenewJitterProp = SaslConfigs.SASL_KERBEROS_TICKET_RENEW_JITTER
  val SaslKerberosMinTimeBeforeReloginProp = SaslConfigs.SASL_KERBEROS_MIN_TIME_BEFORE_RELOGIN
  val SaslKerberosPrincipalToLocalRulesProp = BrokerSecurityConfigs.SASL_KERBEROS_PRINCIPAL_TO_LOCAL_RULES_CONFIG
  val SaslLoginRefreshWindowFactorProp = SaslConfigs.SASL_LOGIN_REFRESH_WINDOW_FACTOR
  val SaslLoginRefreshWindowJitterProp = SaslConfigs.SASL_LOGIN_REFRESH_WINDOW_JITTER
  val SaslLoginRefreshMinPeriodSecondsProp = SaslConfigs.SASL_LOGIN_REFRESH_MIN_PERIOD_SECONDS
  val SaslLoginRefreshBufferSecondsProp = SaslConfigs.SASL_LOGIN_REFRESH_BUFFER_SECONDS

  /** ********* Delegation Token Configuration ****************/
  val DelegationTokenSecretKeyProp = "delegation.token.secret.key"
  val DelegationTokenMaxLifeTimeProp = "delegation.token.max.lifetime.ms"
  val DelegationTokenExpiryTimeMsProp = "delegation.token.expiry.time.ms"
  val DelegationTokenExpiryCheckIntervalMsProp = "delegation.token.expiry.check.interval.ms"

  /** ********* Password encryption configuration for dynamic configs *********/
  val PasswordEncoderSecretProp = "password.encoder.secret"
  val PasswordEncoderOldSecretProp = "password.encoder.old.secret"
  val PasswordEncoderKeyFactoryAlgorithmProp = "password.encoder.keyfactory.algorithm"
  val PasswordEncoderCipherAlgorithmProp = "password.encoder.cipher.algorithm"
  val PasswordEncoderKeyLengthProp =  "password.encoder.key.length"
  val PasswordEncoderIterationsProp =  "password.encoder.iterations"

  /* Documentation */
  /** ********* Zookeeper Configuration ***********/
  val ZkConnectDoc = "Specifies the ZooKeeper connection string in the form <code>hostname:port</code> where host and port are the " +
  "host and port of a ZooKeeper server. To allow connecting through other ZooKeeper nodes when that ZooKeeper machine is " +
  "down you can also specify multiple hosts in the form <code>hostname1:port1,hostname2:port2,hostname3:port3</code>.\n" +
  "The server can also have a ZooKeeper chroot path as part of its ZooKeeper connection string which puts its data under some path in the global ZooKeeper namespace. " +
  "For example to give a chroot path of <code>/chroot/path</code> you would give the connection string as <code>hostname1:port1,hostname2:port2,hostname3:port3/chroot/path</code>."
  val ZkSessionTimeoutMsDoc = "Zookeeper session timeout"
  val ZkConnectionTimeoutMsDoc = "The max time that the client waits to establish a connection to zookeeper. If not set, the value in " + ZkSessionTimeoutMsProp + " is used"
  val ZkSyncTimeMsDoc = "How far a ZK follower can be behind a ZK leader"
  val ZkEnableSecureAclsDoc = "Set client to use secure ACLs"
  val ZkMaxInFlightRequestsDoc = "The maximum number of unacknowledged requests the client will send to Zookeeper before blocking."
  val ZkSslClientEnableDoc = "Set client to use TLS when connecting to ZooKeeper." +
    " An explicit value overrides any value set via the <code>zookeeper.client.secure</code> system property (note the different name)." +
    s" Defaults to false if neither is set; when true, <code>$ZkClientCnxnSocketProp</code> must be set (typically to <code>org.apache.zookeeper.ClientCnxnSocketNetty</code>); other values to set may include " +
    ZkSslConfigToSystemPropertyMap.keys.toList.sorted.filter(x => x != ZkSslClientEnableProp && x != ZkClientCnxnSocketProp).mkString("<code>", "</code>, <code>", "</code>")
  val ZkClientCnxnSocketDoc = "Typically set to <code>org.apache.zookeeper.ClientCnxnSocketNetty</code> when using TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the same-named <code>${ZkSslConfigToSystemPropertyMap(ZkClientCnxnSocketProp)}</code> system property."
  val ZkSslKeyStoreLocationDoc = "Keystore location when using a client-side certificate with TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslKeyStoreLocationProp)}</code> system property (note the camelCase)."
  val ZkSslKeyStorePasswordDoc = "Keystore password when using a client-side certificate with TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslKeyStorePasswordProp)}</code> system property (note the camelCase)." +
    " Note that ZooKeeper does not support a key password different from the keystore password, so be sure to set the key password in the keystore to be identical to the keystore password; otherwise the connection attempt to Zookeeper will fail."
  val ZkSslKeyStoreTypeDoc = "Keystore type when using a client-side certificate with TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslKeyStoreTypeProp)}</code> system property (note the camelCase)." +
    " The default value of <code>null</code> means the type will be auto-detected based on the filename extension of the keystore."
  val ZkSslTrustStoreLocationDoc = "Truststore location when using TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslTrustStoreLocationProp)}</code> system property (note the camelCase)."
  val ZkSslTrustStorePasswordDoc = "Truststore password when using TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslTrustStorePasswordProp)}</code> system property (note the camelCase)."
  val ZkSslTrustStoreTypeDoc = "Truststore type when using TLS connectivity to ZooKeeper." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslTrustStoreTypeProp)}</code> system property (note the camelCase)." +
    " The default value of <code>null</code> means the type will be auto-detected based on the filename extension of the truststore."
  val ZkSslProtocolDoc = "Specifies the protocol to be used in ZooKeeper TLS negotiation." +
    s" An explicit value overrides any value set via the same-named <code>${ZkSslConfigToSystemPropertyMap(ZkSslProtocolProp)}</code> system property."
  val ZkSslEnabledProtocolsDoc = "Specifies the enabled protocol(s) in ZooKeeper TLS negotiation (csv)." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslEnabledProtocolsProp)}</code> system property (note the camelCase)." +
    s" The default value of <code>null</code> means the enabled protocol will be the value of the <code>${KafkaConfig.ZkSslProtocolProp}</code> configuration property."
  val ZkSslCipherSuitesDoc = "Specifies the enabled cipher suites to be used in ZooKeeper TLS negotiation (csv)." +
    s""" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslCipherSuitesProp)}</code> system property (note the single word \"ciphersuites\").""" +
    " The default value of <code>null</code> means the list of enabled cipher suites is determined by the Java runtime being used."
  val ZkSslEndpointIdentificationAlgorithmDoc = "Specifies whether to enable hostname verification in the ZooKeeper TLS negotiation process, with (case-insensitively) \"https\" meaning ZooKeeper hostname verification is enabled and an explicit blank value meaning it is disabled (disabling it is only recommended for testing purposes)." +
    s""" An explicit value overrides any \"true\" or \"false\" value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslEndpointIdentificationAlgorithmProp)}</code> system property (note the different name and values; true implies https and false implies blank)."""
  val ZkSslCrlEnableDoc = "Specifies whether to enable Certificate Revocation List in the ZooKeeper TLS protocols." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslCrlEnableProp)}</code> system property (note the shorter name)."
  val ZkSslOcspEnableDoc = "Specifies whether to enable Online Certificate Status Protocol in the ZooKeeper TLS protocols." +
    s" Overrides any explicit value set via the <code>${ZkSslConfigToSystemPropertyMap(ZkSslOcspEnableProp)}</code> system property (note the shorter name)."
  /** ********* General Configuration ***********/
  val BrokerIdGenerationEnableDoc = s"Enable automatic broker id generation on the server. When enabled the value configured for $MaxReservedBrokerIdProp should be reviewed."
  val MaxReservedBrokerIdDoc = "Max number that can be used for a broker.id"
  val BrokerIdDoc = "The broker id for this server. If unset, a unique broker id will be generated." +
  "To avoid conflicts between zookeeper generated broker id's and user configured broker id's, generated broker ids " +
  "start from " + MaxReservedBrokerIdProp + " + 1."
  val MessageMaxBytesDoc = TopicConfig.MAX_MESSAGE_BYTES_DOC +
    s"This can be set per topic with the topic level <code>${TopicConfig.MAX_MESSAGE_BYTES_CONFIG}</code> config."
  val NumNetworkThreadsDoc = "The number of threads that the server uses for receiving requests from the network and sending responses to the network"
  val NumIoThreadsDoc = "The number of threads that the server uses for processing requests, which may include disk I/O"
  val NumReplicaAlterLogDirsThreadsDoc = "The number of threads that can move replicas between log directories, which may include disk I/O"
  val BackgroundThreadsDoc = "The number of threads to use for various background processing tasks"
  val QueuedMaxRequestsDoc = "The number of queued requests allowed for data-plane, before blocking the network threads"
  val QueuedMaxRequestBytesDoc = "The number of queued bytes allowed before no more requests are read"
  val RequestTimeoutMsDoc = CommonClientConfigs.REQUEST_TIMEOUT_MS_DOC
  val ConnectionSetupTimeoutMsDoc = CommonClientConfigs.SOCKET_CONNECTION_SETUP_TIMEOUT_MS_DOC
  val ConnectionSetupTimeoutMaxMsDoc = CommonClientConfigs.SOCKET_CONNECTION_SETUP_TIMEOUT_MAX_MS_DOC

  /** KRaft mode configs */
  val ProcessRolesDoc = "The roles that this process plays: 'broker', 'controller', or 'broker,controller' if it is both. " +
    "This configuration is only applicable for clusters in KRaft (Kafka Raft) mode (instead of ZooKeeper). Leave this config undefined or empty for Zookeeper clusters."
  val InitialBrokerRegistrationTimeoutMsDoc = "When initially registering with the controller quorum, the number of milliseconds to wait before declaring failure and exiting the broker process."
  val BrokerHeartbeatIntervalMsDoc = "The length of time in milliseconds between broker heartbeats. Used when running in KRaft mode."
  val BrokerSessionTimeoutMsDoc = "The length of time in milliseconds that a broker lease lasts if no heartbeats are made. Used when running in KRaft mode."
  val NodeIdDoc = "The node ID associated with the roles this process is playing when `process.roles` is non-empty. " +
    "This is required configuration when running in KRaft mode."
  val MetadataLogDirDoc = "This configuration determines where we put the metadata log for clusters in KRaft mode. " +
    "If it is not set, the metadata log is placed in the first log directory from log.dirs."
  val ControllerListenerNamesDoc = "A comma-separated list of the names of the listeners used by the controller. This is required " +
    "if running in KRaft mode. The ZK-based controller will not use this configuration."
  val SaslMechanismControllerProtocolDoc = "SASL mechanism used for communication with controllers. Default is GSSAPI."

  /************* Authorizer Configuration ***********/
  val AuthorizerClassNameDoc = s"The fully qualified name of a class that implements s${classOf[Authorizer].getName}" +
  " interface, which is used by the broker for authorization. This config also supports authorizers that implement the deprecated" +
  " kafka.security.auth.Authorizer trait which was previously used for authorization."
  /** ********* Socket Server Configuration ***********/
  val PortDoc = "DEPRECATED: only used when <code>listeners</code> is not set. " +
  "Use <code>listeners</code> instead. \n" +
  "the port to listen and accept connections on"
  val HostNameDoc = "DEPRECATED: only used when <code>listeners</code> is not set. " +
  "Use <code>listeners</code> instead. \n" +
  "hostname of broker. If this is set, it will only bind to this address. If this is not set, it will bind to all interfaces"
  val ListenersDoc = "Listener List - Comma-separated list of URIs we will listen on and the listener names." +
    s" If the listener name is not a security protocol, <code>$ListenerSecurityProtocolMapProp</code> must also be set.\n" +
    " Listener names and port numbers must be unique.\n" +
    " Specify hostname as 0.0.0.0 to bind to all interfaces.\n" +
    " Leave hostname empty to bind to default interface.\n" +
    " Examples of legal listener lists:\n" +
    " PLAINTEXT://myhost:9092,SSL://:9091\n" +
    " CLIENT://0.0.0.0:9092,REPLICATION://localhost:9093\n"
  val AdvertisedHostNameDoc = "DEPRECATED: only used when <code>advertised.listeners</code> or <code>listeners</code> are not set. " +
  "Use <code>advertised.listeners</code> instead. \n" +
  "Hostname to publish to ZooKeeper for clients to use. In IaaS environments, this may " +
  "need to be different from the interface to which the broker binds. If this is not set, " +
  "it will use the value for <code>host.name</code> if configured. Otherwise " +
  "it will use the value returned from java.net.InetAddress.getCanonicalHostName()."
  val AdvertisedPortDoc = "DEPRECATED: only used when <code>advertised.listeners</code> or <code>listeners</code> are not set. " +
  "Use <code>advertised.listeners</code> instead. \n" +
  "The port to publish to ZooKeeper for clients to use. In IaaS environments, this may " +
  "need to be different from the port to which the broker binds. If this is not set, " +
  "it will publish the same port that the broker binds to."
  val AdvertisedListenersDoc = s"Listeners to publish to ZooKeeper for clients to use, if different than the <code>$ListenersProp</code> config property." +
    " In IaaS environments, this may need to be different from the interface to which the broker binds." +
    s" If this is not set, the value for <code>$ListenersProp</code> will be used." +
    s" Unlike <code>$ListenersProp</code>, it is not valid to advertise the 0.0.0.0 meta-address.\n" +
    s" Also unlike <code>$ListenersProp</code>, there can be duplicated ports in this property," +
    " so that one listener can be configured to advertise another listener's address." +
    " This can be useful in some cases where external load balancers are used."
  val ListenerSecurityProtocolMapDoc = "Map between listener names and security protocols. This must be defined for " +
    "the same security protocol to be usable in more than one port or IP. For example, internal and " +
    "external traffic can be separated even if SSL is required for both. Concretely, the user could define listeners " +
    "with names INTERNAL and EXTERNAL and this property as: `INTERNAL:SSL,EXTERNAL:SSL`. As shown, key and value are " +
    "separated by a colon and map entries are separated by commas. Each listener name should only appear once in the map. " +
    "Different security (SSL and SASL) settings can be configured for each listener by adding a normalised " +
    "prefix (the listener name is lowercased) to the config name. For example, to set a different keystore for the " +
    "INTERNAL listener, a config with name <code>listener.name.internal.ssl.keystore.location</code> would be set. " +
    "If the config for the listener name is not set, the config will fallback to the generic config (i.e. <code>ssl.keystore.location</code>). "
  val controlPlaneListenerNameDoc = "Name of listener used for communication between controller and brokers. " +
    s"Broker will use the $ControlPlaneListenerNameProp to locate the endpoint in $ListenersProp list, to listen for connections from the controller. " +
    "For example, if a broker's config is :\n" +
    "listeners = INTERNAL://192.1.1.8:9092, EXTERNAL://10.1.1.5:9093, CONTROLLER://192.1.1.8:9094\n" +
    "listener.security.protocol.map = INTERNAL:PLAINTEXT, EXTERNAL:SSL, CONTROLLER:SSL\n" +
    "control.plane.listener.name = CONTROLLER\n" +
    "On startup, the broker will start listening on \"192.1.1.8:9094\" with security protocol \"SSL\".\n" +
    s"On controller side, when it discovers a broker's published endpoints through zookeeper, it will use the $ControlPlaneListenerNameProp " +
    "to find the endpoint, which it will use to establish connection to the broker.\n" +
    "For example, if the broker's published endpoints on zookeeper are :\n" +
    "\"endpoints\" : [\"INTERNAL://broker1.example.com:9092\",\"EXTERNAL://broker1.example.com:9093\",\"CONTROLLER://broker1.example.com:9094\"]\n" +
    " and the controller's config is :\n" +
    "listener.security.protocol.map = INTERNAL:PLAINTEXT, EXTERNAL:SSL, CONTROLLER:SSL\n" +
    "control.plane.listener.name = CONTROLLER\n" +
    "then controller will use \"broker1.example.com:9094\" with security protocol \"SSL\" to connect to the broker.\n" +
    "If not explicitly configured, the default value will be null and there will be no dedicated endpoints for controller connections."

  val SocketSendBufferBytesDoc = "The SO_SNDBUF buffer of the socket server sockets. If the value is -1, the OS default will be used."
  val SocketReceiveBufferBytesDoc = "The SO_RCVBUF buffer of the socket server sockets. If the value is -1, the OS default will be used."
  val SocketRequestMaxBytesDoc = "The maximum number of bytes in a socket request"
  val MaxConnectionsPerIpDoc = "The maximum number of connections we allow from each ip address. This can be set to 0 if there are overrides " +
    s"configured using $MaxConnectionsPerIpOverridesProp property. New connections from the ip address are dropped if the limit is reached."
  val MaxConnectionsPerIpOverridesDoc = "A comma-separated list of per-ip or hostname overrides to the default maximum number of connections. " +
    "An example value is \"hostName:100,127.0.0.1:200\""
  val MaxConnectionsDoc = "The maximum number of connections we allow in the broker at any time. This limit is applied in addition " +
    s"to any per-ip limits configured using $MaxConnectionsPerIpProp. Listener-level limits may also be configured by prefixing the " +
    s"config name with the listener prefix, for example, <code>listener.name.internal.$MaxConnectionsProp</code>. Broker-wide limit " +
    "should be configured based on broker capacity while listener limits should be configured based on application requirements. " +
    "New connections are blocked if either the listener or broker limit is reached. Connections on the inter-broker listener are " +
    "permitted even if broker-wide limit is reached. The least recently used connection on another listener will be closed in this case."
  val MaxConnectionCreationRateDoc = "The maximum connection creation rate we allow in the broker at any time. Listener-level limits " +
    s"may also be configured by prefixing the config name with the listener prefix, for example, <code>listener.name.internal.$MaxConnectionCreationRateProp</code>." +
    "Broker-wide connection rate limit should be configured based on broker capacity while listener limits should be configured based on " +
    "application requirements. New connections will be throttled if either the listener or the broker limit is reached, with the exception " +
    "of inter-broker listener. Connections on the inter-broker listener will be throttled only when the listener-level rate limit is reached."
  val ConnectionsMaxIdleMsDoc = "Idle connections timeout: the server socket processor threads close the connections that idle more than this"
  val FailedAuthenticationDelayMsDoc = "Connection close delay on failed authentication: this is the time (in milliseconds) by which connection close will be delayed on authentication failure. " +
    s"This must be configured to be less than $ConnectionsMaxIdleMsProp to prevent connection timeout."
  /************* Rack Configuration **************/
  val RackDoc = "Rack of the broker. This will be used in rack aware replication assignment for fault tolerance. Examples: `RACK1`, `us-east-1d`"
  /** ********* Log Configuration ***********/
  val NumPartitionsDoc = "The default number of log partitions per topic"
  val LogDirDoc = "The directory in which the log data is kept (supplemental for " + LogDirsProp + " property)"
  val LogDirsDoc = "The directories in which the log data is kept. If not set, the value in " + LogDirProp + " is used"
  val LogSegmentBytesDoc = "The maximum size of a single log file"
  val LogRollTimeMillisDoc = "The maximum time before a new log segment is rolled out (in milliseconds). If not set, the value in " + LogRollTimeHoursProp + " is used"
  val LogRollTimeHoursDoc = "The maximum time before a new log segment is rolled out (in hours), secondary to " + LogRollTimeMillisProp + " property"

  val LogRollTimeJitterMillisDoc = "The maximum jitter to subtract from logRollTimeMillis (in milliseconds). If not set, the value in " + LogRollTimeJitterHoursProp + " is used"
  val LogRollTimeJitterHoursDoc = "The maximum jitter to subtract from logRollTimeMillis (in hours), secondary to " + LogRollTimeJitterMillisProp + " property"

  val LogRetentionTimeMillisDoc = "The number of milliseconds to keep a log file before deleting it (in milliseconds), If not set, the value in " + LogRetentionTimeMinutesProp + " is used. If set to -1, no time limit is applied."
  val LogRetentionTimeMinsDoc = "The number of minutes to keep a log file before deleting it (in minutes), secondary to " + LogRetentionTimeMillisProp + " property. If not set, the value in " + LogRetentionTimeHoursProp + " is used"
  val LogRetentionTimeHoursDoc = "The number of hours to keep a log file before deleting it (in hours), tertiary to " + LogRetentionTimeMillisProp + " property"

  val LogRetentionBytesDoc = "The maximum size of the log before deleting it"
  val LogCleanupIntervalMsDoc = "The frequency in milliseconds that the log cleaner checks whether any log is eligible for deletion"
  val LogCleanupPolicyDoc = "The default cleanup policy for segments beyond the retention window. A comma separated list of valid policies. Valid policies are: \"delete\" and \"compact\""
  val LogCleanerThreadsDoc = "The number of background threads to use for log cleaning"
  val LogCleanerIoMaxBytesPerSecondDoc = "The log cleaner will be throttled so that the sum of its read and write i/o will be less than this value on average"
  val LogCleanerDedupeBufferSizeDoc = "The total memory used for log deduplication across all cleaner threads"
  val LogCleanerIoBufferSizeDoc = "The total memory used for log cleaner I/O buffers across all cleaner threads"
  val LogCleanerDedupeBufferLoadFactorDoc = "Log cleaner dedupe buffer load factor. The percentage full the dedupe buffer can become. A higher value " +
  "will allow more log to be cleaned at once but will lead to more hash collisions"
  val LogCleanerBackoffMsDoc = "The amount of time to sleep when there are no logs to clean"
  val LogCleanerMinCleanRatioDoc = "The minimum ratio of dirty log to total log for a log to eligible for cleaning. " +
    "If the " + LogCleanerMaxCompactionLagMsProp + " or the " + LogCleanerMinCompactionLagMsProp +
    " configurations are also specified, then the log compactor considers the log eligible for compaction " +
    "as soon as either: (i) the dirty ratio threshold has been met and the log has had dirty (uncompacted) " +
    "records for at least the " + LogCleanerMinCompactionLagMsProp + " duration, or (ii) if the log has had " +
    "dirty (uncompacted) records for at most the " + LogCleanerMaxCompactionLagMsProp + " period."
  val LogCleanerEnableDoc = "Enable the log cleaner process to run on the server. Should be enabled if using any topics with a cleanup.policy=compact including the internal offsets topic. If disabled those topics will not be compacted and continually grow in size."
  val LogCleanerDeleteRetentionMsDoc = "How long are delete records retained?"
  val LogCleanerMinCompactionLagMsDoc = "The minimum time a message will remain uncompacted in the log. Only applicable for logs that are being compacted."
  val LogCleanerMaxCompactionLagMsDoc = "The maximum time a message will remain ineligible for compaction in the log. Only applicable for logs that are being compacted."
  val LogIndexSizeMaxBytesDoc = "The maximum size in bytes of the offset index"
  val LogIndexIntervalBytesDoc = "The interval with which we add an entry to the offset index"
  val LogFlushIntervalMessagesDoc = "The number of messages accumulated on a log partition before messages are flushed to disk "
  val LogDeleteDelayMsDoc = "The amount of time to wait before deleting a file from the filesystem"
  val LogFlushSchedulerIntervalMsDoc = "The frequency in ms that the log flusher checks whether any log needs to be flushed to disk"
  val LogFlushIntervalMsDoc = "The maximum time in ms that a message in any topic is kept in memory before flushed to disk. If not set, the value in " + LogFlushSchedulerIntervalMsProp + " is used"
  val LogFlushOffsetCheckpointIntervalMsDoc = "The frequency with which we update the persistent record of the last flush which acts as the log recovery point"
  val LogFlushStartOffsetCheckpointIntervalMsDoc = "The frequency with which we update the persistent record of log start offset"
  val LogPreAllocateEnableDoc = "Should pre allocate file when create new segment? If you are using Kafka on Windows, you probably need to set it to true."
  val LogMessageFormatVersionDoc = "Specify the message format version the broker will use to append messages to the logs. The value should be a valid ApiVersion. " +
    "Some examples are: 0.8.2, 0.9.0.0, 0.10.0, check ApiVersion for more details. By setting a particular message format version, the " +
    "user is certifying that all the existing messages on disk are smaller or equal than the specified version. Setting this value incorrectly " +
    "will cause consumers with older versions to break as they will receive messages with a format that they don't understand."

  val LogMessageTimestampTypeDoc = "Define whether the timestamp in the message is message create time or log append time. The value should be either " +
    "`CreateTime` or `LogAppendTime`"

  val LogMessageTimestampDifferenceMaxMsDoc = "The maximum difference allowed between the timestamp when a broker receives " +
    "a message and the timestamp specified in the message. If log.message.timestamp.type=CreateTime, a message will be rejected " +
    "if the difference in timestamp exceeds this threshold. This configuration is ignored if log.message.timestamp.type=LogAppendTime." +
    "The maximum timestamp difference allowed should be no greater than log.retention.ms to avoid unnecessarily frequent log rolling."
  val NumRecoveryThreadsPerDataDirDoc = "The number of threads per data directory to be used for log recovery at startup and flushing at shutdown"
  val AutoCreateTopicsEnableDoc = "Enable auto creation of topic on the server"
  val MinInSyncReplicasDoc = "When a producer sets acks to \"all\" (or \"-1\"), " +
    "min.insync.replicas specifies the minimum number of replicas that must acknowledge " +
    "a write for the write to be considered successful. If this minimum cannot be met, " +
    "then the producer will raise an exception (either NotEnoughReplicas or " +
    "NotEnoughReplicasAfterAppend).<br>When used together, min.insync.replicas and acks " +
    "allow you to enforce greater durability guarantees. A typical scenario would be to " +
    "create a topic with a replication factor of 3, set min.insync.replicas to 2, and " +
    "produce with acks of \"all\". This will ensure that the producer raises an exception " +
    "if a majority of replicas do not receive a write."

  val CreateTopicPolicyClassNameDoc = "The create topic policy class that should be used for validation. The class should " +
    "implement the <code>org.apache.kafka.server.policy.CreateTopicPolicy</code> interface."
  val AlterConfigPolicyClassNameDoc = "The alter configs policy class that should be used for validation. The class should " +
    "implement the <code>org.apache.kafka.server.policy.AlterConfigPolicy</code> interface."
  val LogMessageDownConversionEnableDoc = TopicConfig.MESSAGE_DOWNCONVERSION_ENABLE_DOC;

  /** ********* Replication configuration ***********/
  val ControllerSocketTimeoutMsDoc = "The socket timeout for controller-to-broker channels"
  val ControllerMessageQueueSizeDoc = "The buffer size for controller-to-broker-channels"
  val DefaultReplicationFactorDoc = "default replication factors for automatically created topics"
  val ReplicaLagTimeMaxMsDoc = "If a follower hasn't sent any fetch requests or hasn't consumed up to the leaders log end offset for at least this time," +
  " the leader will remove the follower from isr"
  val ReplicaSocketTimeoutMsDoc = "The socket timeout for network requests. Its value should be at least replica.fetch.wait.max.ms"
  val ReplicaSocketReceiveBufferBytesDoc = "The socket receive buffer for network requests"
  val ReplicaFetchMaxBytesDoc = "The number of bytes of messages to attempt to fetch for each partition. This is not an absolute maximum, " +
    "if the first record batch in the first non-empty partition of the fetch is larger than this value, the record batch will still be returned " +
    "to ensure that progress can be made. The maximum record batch size accepted by the broker is defined via " +
    "<code>message.max.bytes</code> (broker config) or <code>max.message.bytes</code> (topic config)."
  val ReplicaFetchWaitMaxMsDoc = "max wait time for each fetcher request issued by follower replicas. This value should always be less than the " +
  "replica.lag.time.max.ms at all times to prevent frequent shrinking of ISR for low throughput topics"
  val ReplicaFetchMinBytesDoc = "Minimum bytes expected for each fetch response. If not enough bytes, wait up to <code>replica.fetch.wait.max.ms</code> (broker config)."
  val ReplicaFetchResponseMaxBytesDoc = "Maximum bytes expected for the entire fetch response. Records are fetched in batches, " +
    "and if the first record batch in the first non-empty partition of the fetch is larger than this value, the record batch " +
    "will still be returned to ensure that progress can be made. As such, this is not an absolute maximum. The maximum " +
    "record batch size accepted by the broker is defined via <code>message.max.bytes</code> (broker config) or " +
    "<code>max.message.bytes</code> (topic config)."
  val NumReplicaFetchersDoc = "Number of fetcher threads used to replicate messages from a source broker. " +
  "Increasing this value can increase the degree of I/O parallelism in the follower broker."
  val ReplicaFetchBackoffMsDoc = "The amount of time to sleep when fetch partition error occurs."
  val ReplicaHighWatermarkCheckpointIntervalMsDoc = "The frequency with which the high watermark is saved out to disk"
  val FetchPurgatoryPurgeIntervalRequestsDoc = "The purge interval (in number of requests) of the fetch request purgatory"
  val ProducerPurgatoryPurgeIntervalRequestsDoc = "The purge interval (in number of requests) of the producer request purgatory"
  val DeleteRecordsPurgatoryPurgeIntervalRequestsDoc = "The purge interval (in number of requests) of the delete records request purgatory"
  val AutoLeaderRebalanceEnableDoc = "Enables auto leader balancing. A background thread checks the distribution of partition leaders at regular intervals, configurable by `leader.imbalance.check.interval.seconds`. If the leader imbalance exceeds `leader.imbalance.per.broker.percentage`, leader rebalance to the preferred leader for partitions is triggered."
  val LeaderImbalancePerBrokerPercentageDoc = "The ratio of leader imbalance allowed per broker. The controller would trigger a leader balance if it goes above this value per broker. The value is specified in percentage."
  val LeaderImbalanceCheckIntervalSecondsDoc = "The frequency with which the partition rebalance check is triggered by the controller"
  val UncleanLeaderElectionEnableDoc = "Indicates whether to enable replicas not in the ISR set to be elected as leader as a last resort, even though doing so may result in data loss"
  val InterBrokerSecurityProtocolDoc = "Security protocol used to communicate between brokers. Valid values are: " +
    s"${SecurityProtocol.names.asScala.mkString(", ")}. It is an error to set this and $InterBrokerListenerNameProp " +
    "properties at the same time."
  val InterBrokerProtocolVersionDoc = "Specify which version of the inter-broker protocol will be used.\n" +
  " This is typically bumped after all brokers were upgraded to a new version.\n" +
  " Example of some valid values are: 0.8.0, 0.8.1, 0.8.1.1, 0.8.2, 0.8.2.0, 0.8.2.1, 0.9.0.0, 0.9.0.1 Check ApiVersion for the full list."
  val InterBrokerListenerNameDoc = s"Name of listener used for communication between brokers. If this is unset, the listener name is defined by $InterBrokerSecurityProtocolProp. " +
    s"It is an error to set this and $InterBrokerSecurityProtocolProp properties at the same time."
  val ReplicaSelectorClassDoc = "The fully qualified class name that implements ReplicaSelector. This is used by the broker to find the preferred read replica. By default, we use an implementation that returns the leader."
  /** ********* Controlled shutdown configuration ***********/
  val ControlledShutdownMaxRetriesDoc = "Controlled shutdown can fail for multiple reasons. This determines the number of retries when such failure happens"
  val ControlledShutdownRetryBackoffMsDoc = "Before each retry, the system needs time to recover from the state that caused the previous failure (Controller fail over, replica lag etc). This config determines the amount of time to wait before retrying."
  val ControlledShutdownEnableDoc = "Enable controlled shutdown of the server"
  /** ********* Group coordinator configuration ***********/
  val GroupMinSessionTimeoutMsDoc = "The minimum allowed session timeout for registered consumers. Shorter timeouts result in quicker failure detection at the cost of more frequent consumer heartbeating, which can overwhelm broker resources."
  val GroupMaxSessionTimeoutMsDoc = "The maximum allowed session timeout for registered consumers. Longer timeouts give consumers more time to process messages in between heartbeats at the cost of a longer time to detect failures."
  val GroupInitialRebalanceDelayMsDoc = "The amount of time the group coordinator will wait for more consumers to join a new group before performing the first rebalance. A longer delay means potentially fewer rebalances, but increases the time until processing begins."
  val GroupMaxSizeDoc = "The maximum number of consumers that a single consumer group can accommodate."
  /** ********* Offset management configuration ***********/
  val OffsetMetadataMaxSizeDoc = "The maximum size for a metadata entry associated with an offset commit"
  val OffsetsLoadBufferSizeDoc = "Batch size for reading from the offsets segments when loading offsets into the cache (soft-limit, overridden if records are too large)."
  val OffsetsTopicReplicationFactorDoc = "The replication factor for the offsets topic (set higher to ensure availability). " +
  "Internal topic creation will fail until the cluster size meets this replication factor requirement."
  val OffsetsTopicPartitionsDoc = "The number of partitions for the offset commit topic (should not change after deployment)"
  val OffsetsTopicSegmentBytesDoc = "The offsets topic segment bytes should be kept relatively small in order to facilitate faster log compaction and cache loads"
  val OffsetsTopicCompressionCodecDoc = "Compression codec for the offsets topic - compression may be used to achieve \"atomic\" commits"
  val OffsetsRetentionMinutesDoc = "After a consumer group loses all its consumers (i.e. becomes empty) its offsets will be kept for this retention period before getting discarded. " +
    "For standalone consumers (using manual assignment), offsets will be expired after the time of last commit plus this retention period."
  val OffsetsRetentionCheckIntervalMsDoc = "Frequency at which to check for stale offsets"
  val OffsetCommitTimeoutMsDoc = "Offset commit will be delayed until all replicas for the offsets topic receive the commit " +
  "or this timeout is reached. This is similar to the producer request timeout."
  val OffsetCommitRequiredAcksDoc = "The required acks before the commit can be accepted. In general, the default (-1) should not be overridden"
  /** ********* Transaction management configuration ***********/
  val TransactionalIdExpirationMsDoc = "The time in ms that the transaction coordinator will wait without receiving any transaction status updates " +
    "for the current transaction before expiring its transactional id. This setting also influences producer id expiration - producer ids are expired " +
    "once this time has elapsed after the last write with the given producer id. Note that producer ids may expire sooner if the last write from the producer id is deleted due to the topic's retention settings."
  val TransactionsMaxTimeoutMsDoc = "The maximum allowed timeout for transactions. " +
    "If a client’s requested transaction time exceed this, then the broker will return an error in InitProducerIdRequest. This prevents a client from too large of a timeout, which can stall consumers reading from topics included in the transaction."
  val TransactionsTopicMinISRDoc = "Overridden " + MinInSyncReplicasProp + " config for the transaction topic."
  val TransactionsLoadBufferSizeDoc = "Batch size for reading from the transaction log segments when loading producer ids and transactions into the cache (soft-limit, overridden if records are too large)."
  val TransactionsTopicReplicationFactorDoc = "The replication factor for the transaction topic (set higher to ensure availability). " +
    "Internal topic creation will fail until the cluster size meets this replication factor requirement."
  val TransactionsTopicPartitionsDoc = "The number of partitions for the transaction topic (should not change after deployment)."
  val TransactionsTopicSegmentBytesDoc = "The transaction topic segment bytes should be kept relatively small in order to facilitate faster log compaction and cache loads"
  val TransactionsAbortTimedOutTransactionsIntervalMsDoc = "The interval at which to rollback transactions that have timed out"
  val TransactionsRemoveExpiredTransactionsIntervalMsDoc = "The interval at which to remove transactions that have expired due to <code>transactional.id.expiration.ms</code> passing"

  /** ********* Fetch Configuration **************/
  val MaxIncrementalFetchSessionCacheSlotsDoc = "The maximum number of incremental fetch sessions that we will maintain."
  val FetchMaxBytesDoc = "The maximum number of bytes we will return for a fetch request. Must be at least 1024."

  /** ********* Quota Configuration ***********/
  val ProducerQuotaBytesPerSecondDefaultDoc = "DEPRECATED: Used only when dynamic default quotas are not configured for <user>, <client-id> or <user, client-id> in Zookeeper. " +
  "Any producer distinguished by clientId will get throttled if it produces more bytes than this value per-second"
  val ConsumerQuotaBytesPerSecondDefaultDoc = "DEPRECATED: Used only when dynamic default quotas are not configured for <user, <client-id> or <user, client-id> in Zookeeper. " +
  "Any consumer distinguished by clientId/consumer group will get throttled if it fetches more bytes than this value per-second"
  val NumQuotaSamplesDoc = "The number of samples to retain in memory for client quotas"
  val NumReplicationQuotaSamplesDoc = "The number of samples to retain in memory for replication quotas"
  val NumAlterLogDirsReplicationQuotaSamplesDoc = "The number of samples to retain in memory for alter log dirs replication quotas"
  val NumControllerQuotaSamplesDoc = "The number of samples to retain in memory for controller mutation quotas"
  val QuotaWindowSizeSecondsDoc = "The time span of each sample for client quotas"
  val ReplicationQuotaWindowSizeSecondsDoc = "The time span of each sample for replication quotas"
  val AlterLogDirsReplicationQuotaWindowSizeSecondsDoc = "The time span of each sample for alter log dirs replication quotas"
  val ControllerQuotaWindowSizeSecondsDoc = "The time span of each sample for controller mutations quotas"

  val ClientQuotaCallbackClassDoc = "The fully qualified name of a class that implements the ClientQuotaCallback interface, " +
    "which is used to determine quota limits applied to client requests. By default, <user, client-id>, <user> or <client-id> " +
    "quotas stored in ZooKeeper are applied. For any given request, the most specific quota that matches the user principal " +
    "of the session and the client-id of the request is applied."

  val DeleteTopicEnableDoc = "Enables delete topic. Delete topic through the admin tool will have no effect if this config is turned off"
  val CompressionTypeDoc = "Specify the final compression type for a given topic. This configuration accepts the standard compression codecs " +
  "('gzip', 'snappy', 'lz4', 'zstd'). It additionally accepts 'uncompressed' which is equivalent to no compression; and " +
  "'producer' which means retain the original compression codec set by the producer."

  /** ********* Kafka Metrics Configuration ***********/
  val MetricSampleWindowMsDoc = CommonClientConfigs.METRICS_SAMPLE_WINDOW_MS_DOC
  val MetricNumSamplesDoc = CommonClientConfigs.METRICS_NUM_SAMPLES_DOC
  val MetricReporterClassesDoc = CommonClientConfigs.METRIC_REPORTER_CLASSES_DOC
  val MetricRecordingLevelDoc = CommonClientConfigs.METRICS_RECORDING_LEVEL_DOC


  /** ********* Kafka Yammer Metrics Reporter Configuration ***********/
  val KafkaMetricsReporterClassesDoc = "A list of classes to use as Yammer metrics custom reporters." +
    " The reporters should implement <code>kafka.metrics.KafkaMetricsReporter</code> trait. If a client wants" +
    " to expose JMX operations on a custom reporter, the custom reporter needs to additionally implement an MBean" +
    " trait that extends <code>kafka.metrics.KafkaMetricsReporterMBean</code> trait so that the registered MBean is compliant with" +
    " the standard MBean convention."

  val KafkaMetricsPollingIntervalSecondsDoc = s"The metrics polling interval (in seconds) which can be used" +
    s" in $KafkaMetricsReporterClassesProp implementations."

  /** ******** Common Security Configuration *************/
  val PrincipalBuilderClassDoc = BrokerSecurityConfigs.PRINCIPAL_BUILDER_CLASS_DOC
  val ConnectionsMaxReauthMsDoc = BrokerSecurityConfigs.CONNECTIONS_MAX_REAUTH_MS_DOC
  val securityProviderClassDoc = SecurityConfig.SECURITY_PROVIDERS_DOC

  /** ********* SSL Configuration ****************/
  val SslProtocolDoc = SslConfigs.SSL_PROTOCOL_DOC
  val SslProviderDoc = SslConfigs.SSL_PROVIDER_DOC
  val SslCipherSuitesDoc = SslConfigs.SSL_CIPHER_SUITES_DOC
  val SslEnabledProtocolsDoc = SslConfigs.SSL_ENABLED_PROTOCOLS_DOC
  val SslKeystoreTypeDoc = SslConfigs.SSL_KEYSTORE_TYPE_DOC
  val SslKeystoreLocationDoc = SslConfigs.SSL_KEYSTORE_LOCATION_DOC
  val SslKeystorePasswordDoc = SslConfigs.SSL_KEYSTORE_PASSWORD_DOC
  val SslKeyPasswordDoc = SslConfigs.SSL_KEY_PASSWORD_DOC
  val SslKeystoreKeyDoc = SslConfigs.SSL_KEYSTORE_KEY_DOC
  val SslKeystoreCertificateChainDoc = SslConfigs.SSL_KEYSTORE_CERTIFICATE_CHAIN_DOC
  val SslTruststoreTypeDoc = SslConfigs.SSL_TRUSTSTORE_TYPE_DOC
  val SslTruststorePasswordDoc = SslConfigs.SSL_TRUSTSTORE_PASSWORD_DOC
  val SslTruststoreLocationDoc = SslConfigs.SSL_TRUSTSTORE_LOCATION_DOC
  val SslTruststoreCertificatesDoc = SslConfigs.SSL_TRUSTSTORE_CERTIFICATES_DOC
  val SslKeyManagerAlgorithmDoc = SslConfigs.SSL_KEYMANAGER_ALGORITHM_DOC
  val SslTrustManagerAlgorithmDoc = SslConfigs.SSL_TRUSTMANAGER_ALGORITHM_DOC
  val SslEndpointIdentificationAlgorithmDoc = SslConfigs.SSL_ENDPOINT_IDENTIFICATION_ALGORITHM_DOC
  val SslSecureRandomImplementationDoc = SslConfigs.SSL_SECURE_RANDOM_IMPLEMENTATION_DOC
  val SslClientAuthDoc = BrokerSecurityConfigs.SSL_CLIENT_AUTH_DOC
  val SslPrincipalMappingRulesDoc = BrokerSecurityConfigs.SSL_PRINCIPAL_MAPPING_RULES_DOC
  val SslEngineFactoryClassDoc = SslConfigs.SSL_ENGINE_FACTORY_CLASS_DOC

  /** ********* Sasl Configuration ****************/
  val SaslMechanismInterBrokerProtocolDoc = "SASL mechanism used for inter-broker communication. Default is GSSAPI."
  val SaslJaasConfigDoc = SaslConfigs.SASL_JAAS_CONFIG_DOC
  val SaslEnabledMechanismsDoc = BrokerSecurityConfigs.SASL_ENABLED_MECHANISMS_DOC
  val SaslServerCallbackHandlerClassDoc = BrokerSecurityConfigs.SASL_SERVER_CALLBACK_HANDLER_CLASS_DOC
  val SaslClientCallbackHandlerClassDoc = SaslConfigs.SASL_CLIENT_CALLBACK_HANDLER_CLASS_DOC
  val SaslLoginClassDoc = SaslConfigs.SASL_LOGIN_CLASS_DOC
  val SaslLoginCallbackHandlerClassDoc = SaslConfigs.SASL_LOGIN_CALLBACK_HANDLER_CLASS_DOC
  val SaslKerberosServiceNameDoc = SaslConfigs.SASL_KERBEROS_SERVICE_NAME_DOC
  val SaslKerberosKinitCmdDoc = SaslConfigs.SASL_KERBEROS_KINIT_CMD_DOC
  val SaslKerberosTicketRenewWindowFactorDoc = SaslConfigs.SASL_KERBEROS_TICKET_RENEW_WINDOW_FACTOR_DOC
  val SaslKerberosTicketRenewJitterDoc = SaslConfigs.SASL_KERBEROS_TICKET_RENEW_JITTER_DOC
  val SaslKerberosMinTimeBeforeReloginDoc = SaslConfigs.SASL_KERBEROS_MIN_TIME_BEFORE_RELOGIN_DOC
  val SaslKerberosPrincipalToLocalRulesDoc = BrokerSecurityConfigs.SASL_KERBEROS_PRINCIPAL_TO_LOCAL_RULES_DOC
  val SaslLoginRefreshWindowFactorDoc = SaslConfigs.SASL_LOGIN_REFRESH_WINDOW_FACTOR_DOC
  val SaslLoginRefreshWindowJitterDoc = SaslConfigs.SASL_LOGIN_REFRESH_WINDOW_JITTER_DOC
  val SaslLoginRefreshMinPeriodSecondsDoc = SaslConfigs.SASL_LOGIN_REFRESH_MIN_PERIOD_SECONDS_DOC
  val SaslLoginRefreshBufferSecondsDoc = SaslConfigs.SASL_LOGIN_REFRESH_BUFFER_SECONDS_DOC

  /** ********* Delegation Token Configuration ****************/
  val DelegationTokenSecretKeyDoc = "Secret key to generate and verify delegation tokens. The same key must be configured across all the brokers. " +
    " If the key is not set or set to empty string, brokers will disable the delegation token support."
  val DelegationTokenMaxLifeTimeDoc = "The token has a maximum lifetime beyond which it cannot be renewed anymore. Default value 7 days."
  val DelegationTokenExpiryTimeMsDoc = "The token validity time in miliseconds before the token needs to be renewed. Default value 1 day."
  val DelegationTokenExpiryCheckIntervalDoc = "Scan interval to remove expired delegation tokens."

  /** ********* Password encryption configuration for dynamic configs *********/
  val PasswordEncoderSecretDoc = "The secret used for encoding dynamically configured passwords for this broker."
  val PasswordEncoderOldSecretDoc = "The old secret that was used for encoding dynamically configured passwords. " +
    "This is required only when the secret is updated. If specified, all dynamically encoded passwords are " +
    s"decoded using this old secret and re-encoded using $PasswordEncoderSecretProp when broker starts up."
  val PasswordEncoderKeyFactoryAlgorithmDoc = "The SecretKeyFactory algorithm used for encoding dynamically configured passwords. " +
    "Default is PBKDF2WithHmacSHA512 if available and PBKDF2WithHmacSHA1 otherwise."
  val PasswordEncoderCipherAlgorithmDoc = "The Cipher algorithm used for encoding dynamically configured passwords."
  val PasswordEncoderKeyLengthDoc =  "The key length used for encoding dynamically configured passwords."
  val PasswordEncoderIterationsDoc =  "The iteration count used for encoding dynamically configured passwords."

  private[server] val configDef = {
    import ConfigDef.Importance._
    import ConfigDef.Range._
    import ConfigDef.Type._
    import ConfigDef.ValidString._

    new ConfigDef()

      /** ********* Zookeeper Configuration ***********/
      .define(ZkConnectProp, STRING, null, HIGH, ZkConnectDoc)
      .define(ZkSessionTimeoutMsProp, INT, Defaults.ZkSessionTimeoutMs, HIGH, ZkSessionTimeoutMsDoc)
      .define(ZkConnectionTimeoutMsProp, INT, null, HIGH, ZkConnectionTimeoutMsDoc)
      .define(ZkSyncTimeMsProp, INT, Defaults.ZkSyncTimeMs, LOW, ZkSyncTimeMsDoc)
      .define(ZkEnableSecureAclsProp, BOOLEAN, Defaults.ZkEnableSecureAcls, HIGH, ZkEnableSecureAclsDoc)
      .define(ZkMaxInFlightRequestsProp, INT, Defaults.ZkMaxInFlightRequests, atLeast(1), HIGH, ZkMaxInFlightRequestsDoc)
      .define(ZkSslClientEnableProp, BOOLEAN, Defaults.ZkSslClientEnable, MEDIUM, ZkSslClientEnableDoc)
      .define(ZkClientCnxnSocketProp, STRING, null, MEDIUM, ZkClientCnxnSocketDoc)
      .define(ZkSslKeyStoreLocationProp, STRING, null, MEDIUM, ZkSslKeyStoreLocationDoc)
      .define(ZkSslKeyStorePasswordProp, PASSWORD, null, MEDIUM, ZkSslKeyStorePasswordDoc)
      .define(ZkSslKeyStoreTypeProp, STRING, null, MEDIUM, ZkSslKeyStoreTypeDoc)
      .define(ZkSslTrustStoreLocationProp, STRING, null, MEDIUM, ZkSslTrustStoreLocationDoc)
      .define(ZkSslTrustStorePasswordProp, PASSWORD, null, MEDIUM, ZkSslTrustStorePasswordDoc)
      .define(ZkSslTrustStoreTypeProp, STRING, null, MEDIUM, ZkSslTrustStoreTypeDoc)
      .define(ZkSslProtocolProp, STRING, Defaults.ZkSslProtocol, LOW, ZkSslProtocolDoc)
      .define(ZkSslEnabledProtocolsProp, LIST, null, LOW, ZkSslEnabledProtocolsDoc)
      .define(ZkSslCipherSuitesProp, LIST, null, LOW, ZkSslCipherSuitesDoc)
      .define(ZkSslEndpointIdentificationAlgorithmProp, STRING, Defaults.ZkSslEndpointIdentificationAlgorithm, LOW, ZkSslEndpointIdentificationAlgorithmDoc)
      .define(ZkSslCrlEnableProp, BOOLEAN, Defaults.ZkSslCrlEnable, LOW, ZkSslCrlEnableDoc)
      .define(ZkSslOcspEnableProp, BOOLEAN, Defaults.ZkSslOcspEnable, LOW, ZkSslOcspEnableDoc)

      /** ********* General Configuration ***********/
      .define(BrokerIdGenerationEnableProp, BOOLEAN, Defaults.BrokerIdGenerationEnable, MEDIUM, BrokerIdGenerationEnableDoc)
      .define(MaxReservedBrokerIdProp, INT, Defaults.MaxReservedBrokerId, atLeast(0), MEDIUM, MaxReservedBrokerIdDoc)
      .define(BrokerIdProp, INT, Defaults.BrokerId, HIGH, BrokerIdDoc)
      .define(MessageMaxBytesProp, INT, Defaults.MessageMaxBytes, atLeast(0), HIGH, MessageMaxBytesDoc)
      .define(NumNetworkThreadsProp, INT, Defaults.NumNetworkThreads, atLeast(1), HIGH, NumNetworkThreadsDoc)
      .define(NumIoThreadsProp, INT, Defaults.NumIoThreads, atLeast(1), HIGH, NumIoThreadsDoc)
      .define(NumReplicaAlterLogDirsThreadsProp, INT, null, HIGH, NumReplicaAlterLogDirsThreadsDoc)
      .define(BackgroundThreadsProp, INT, Defaults.BackgroundThreads, atLeast(1), HIGH, BackgroundThreadsDoc)
      .define(QueuedMaxRequestsProp, INT, Defaults.QueuedMaxRequests, atLeast(1), HIGH, QueuedMaxRequestsDoc)
      .define(QueuedMaxBytesProp, LONG, Defaults.QueuedMaxRequestBytes, MEDIUM, QueuedMaxRequestBytesDoc)
      .define(RequestTimeoutMsProp, INT, Defaults.RequestTimeoutMs, HIGH, RequestTimeoutMsDoc)
      .define(ConnectionSetupTimeoutMsProp, LONG, Defaults.ConnectionSetupTimeoutMs, MEDIUM, ConnectionSetupTimeoutMsDoc)
      .define(ConnectionSetupTimeoutMaxMsProp, LONG, Defaults.ConnectionSetupTimeoutMaxMs, MEDIUM, ConnectionSetupTimeoutMaxMsDoc)

      /*
       * KRaft mode configs. Note that these configs are defined as internal. We will make them public in the 3.0.0 release.
       */
      .defineInternal(ProcessRolesProp, LIST, Collections.emptyList(), ValidList.in("broker", "controller"), HIGH, ProcessRolesDoc)
      .defineInternal(NodeIdProp, INT, Defaults.EmptyNodeId, null, HIGH, NodeIdDoc)
      .defineInternal(InitialBrokerRegistrationTimeoutMsProp, INT, Defaults.InitialBrokerRegistrationTimeoutMs, null, MEDIUM, InitialBrokerRegistrationTimeoutMsDoc)
      .defineInternal(BrokerHeartbeatIntervalMsProp, INT, Defaults.BrokerHeartbeatIntervalMs, null, MEDIUM, BrokerHeartbeatIntervalMsDoc)
      .defineInternal(BrokerSessionTimeoutMsProp, INT, Defaults.BrokerSessionTimeoutMs, null, MEDIUM, BrokerSessionTimeoutMsDoc)
      .defineInternal(MetadataLogDirProp, STRING, null, null, HIGH, MetadataLogDirDoc)
      .defineInternal(ControllerListenerNamesProp, STRING, null, null, HIGH, ControllerListenerNamesDoc)
      .defineInternal(SaslMechanismControllerProtocolProp, STRING, SaslConfigs.DEFAULT_SASL_MECHANISM, null, HIGH, SaslMechanismControllerProtocolDoc)

      /************* Authorizer Configuration ***********/
      .define(AuthorizerClassNameProp, STRING, Defaults.AuthorizerClassName, LOW, AuthorizerClassNameDoc)

      /** ********* Socket Server Configuration ***********/
      .define(PortProp, INT, Defaults.Port, HIGH, PortDoc)
      .define(HostNameProp, STRING, Defaults.HostName, HIGH, HostNameDoc)
      .define(ListenersProp, STRING, null, HIGH, ListenersDoc)
      .define(AdvertisedHostNameProp, STRING, null, HIGH, AdvertisedHostNameDoc)
      .define(AdvertisedPortProp, INT, null, HIGH, AdvertisedPortDoc)
      .define(AdvertisedListenersProp, STRING, null, HIGH, AdvertisedListenersDoc)
      .define(ListenerSecurityProtocolMapProp, STRING, Defaults.ListenerSecurityProtocolMap, LOW, ListenerSecurityProtocolMapDoc)
      .define(ControlPlaneListenerNameProp, STRING, null, HIGH, controlPlaneListenerNameDoc)
      .define(SocketSendBufferBytesProp, INT, Defaults.SocketSendBufferBytes, HIGH, SocketSendBufferBytesDoc)
      .define(SocketReceiveBufferBytesProp, INT, Defaults.SocketReceiveBufferBytes, HIGH, SocketReceiveBufferBytesDoc)
      .define(SocketRequestMaxBytesProp, INT, Defaults.SocketRequestMaxBytes, atLeast(1), HIGH, SocketRequestMaxBytesDoc)
      .define(MaxConnectionsPerIpProp, INT, Defaults.MaxConnectionsPerIp, atLeast(0), MEDIUM, MaxConnectionsPerIpDoc)
      .define(MaxConnectionsPerIpOverridesProp, STRING, Defaults.MaxConnectionsPerIpOverrides, MEDIUM, MaxConnectionsPerIpOverridesDoc)
      .define(MaxConnectionsProp, INT, Defaults.MaxConnections, atLeast(0), MEDIUM, MaxConnectionsDoc)
      .define(MaxConnectionCreationRateProp, INT, Defaults.MaxConnectionCreationRate, atLeast(0), MEDIUM, MaxConnectionCreationRateDoc)
      .define(ConnectionsMaxIdleMsProp, LONG, Defaults.ConnectionsMaxIdleMs, MEDIUM, ConnectionsMaxIdleMsDoc)
      .define(FailedAuthenticationDelayMsProp, INT, Defaults.FailedAuthenticationDelayMs, atLeast(0), LOW, FailedAuthenticationDelayMsDoc)

      /************ Rack Configuration ******************/
      .define(RackProp, STRING, null, MEDIUM, RackDoc)

      /** ********* Log Configuration ***********/
      .define(NumPartitionsProp, INT, Defaults.NumPartitions, atLeast(1), MEDIUM, NumPartitionsDoc)
      .define(LogDirProp, STRING, Defaults.LogDir, HIGH, LogDirDoc)
      .define(LogDirsProp, STRING, null, HIGH, LogDirsDoc)
      .define(LogSegmentBytesProp, INT, Defaults.LogSegmentBytes, atLeast(LegacyRecord.RECORD_OVERHEAD_V0), HIGH, LogSegmentBytesDoc)

      .define(LogRollTimeMillisProp, LONG, null, HIGH, LogRollTimeMillisDoc)
      .define(LogRollTimeHoursProp, INT, Defaults.LogRollHours, atLeast(1), HIGH, LogRollTimeHoursDoc)

      .define(LogRollTimeJitterMillisProp, LONG, null, HIGH, LogRollTimeJitterMillisDoc)
      .define(LogRollTimeJitterHoursProp, INT, Defaults.LogRollJitterHours, atLeast(0), HIGH, LogRollTimeJitterHoursDoc)

      .define(LogRetentionTimeMillisProp, LONG, null, HIGH, LogRetentionTimeMillisDoc)
      .define(LogRetentionTimeMinutesProp, INT, null, HIGH, LogRetentionTimeMinsDoc)
      .define(LogRetentionTimeHoursProp, INT, Defaults.LogRetentionHours, HIGH, LogRetentionTimeHoursDoc)

      .define(LogRetentionBytesProp, LONG, Defaults.LogRetentionBytes, HIGH, LogRetentionBytesDoc)
      .define(LogCleanupIntervalMsProp, LONG, Defaults.LogCleanupIntervalMs, atLeast(1), MEDIUM, LogCleanupIntervalMsDoc)
      .define(LogCleanupPolicyProp, LIST, Defaults.LogCleanupPolicy, ValidList.in(Defaults.Compact, Defaults.Delete), MEDIUM, LogCleanupPolicyDoc)
      .define(LogCleanerThreadsProp, INT, Defaults.LogCleanerThreads, atLeast(0), MEDIUM, LogCleanerThreadsDoc)
      .define(LogCleanerIoMaxBytesPerSecondProp, DOUBLE, Defaults.LogCleanerIoMaxBytesPerSecond, MEDIUM, LogCleanerIoMaxBytesPerSecondDoc)
      .define(LogCleanerDedupeBufferSizeProp, LONG, Defaults.LogCleanerDedupeBufferSize, MEDIUM, LogCleanerDedupeBufferSizeDoc)
      .define(LogCleanerIoBufferSizeProp, INT, Defaults.LogCleanerIoBufferSize, atLeast(0), MEDIUM, LogCleanerIoBufferSizeDoc)
      .define(LogCleanerDedupeBufferLoadFactorProp, DOUBLE, Defaults.LogCleanerDedupeBufferLoadFactor, MEDIUM, LogCleanerDedupeBufferLoadFactorDoc)
      .define(LogCleanerBackoffMsProp, LONG, Defaults.LogCleanerBackoffMs, atLeast(0), MEDIUM, LogCleanerBackoffMsDoc)
      .define(LogCleanerMinCleanRatioProp, DOUBLE, Defaults.LogCleanerMinCleanRatio, MEDIUM, LogCleanerMinCleanRatioDoc)
      .define(LogCleanerEnableProp, BOOLEAN, Defaults.LogCleanerEnable, MEDIUM, LogCleanerEnableDoc)
      .define(LogCleanerDeleteRetentionMsProp, LONG, Defaults.LogCleanerDeleteRetentionMs, MEDIUM, LogCleanerDeleteRetentionMsDoc)
      .define(LogCleanerMinCompactionLagMsProp, LONG, Defaults.LogCleanerMinCompactionLagMs, MEDIUM, LogCleanerMinCompactionLagMsDoc)
      .define(LogCleanerMaxCompactionLagMsProp, LONG, Defaults.LogCleanerMaxCompactionLagMs, MEDIUM, LogCleanerMaxCompactionLagMsDoc)
      .define(LogIndexSizeMaxBytesProp, INT, Defaults.LogIndexSizeMaxBytes, atLeast(4), MEDIUM, LogIndexSizeMaxBytesDoc)
      .define(LogIndexIntervalBytesProp, INT, Defaults.LogIndexIntervalBytes, atLeast(0), MEDIUM, LogIndexIntervalBytesDoc)
      .define(LogFlushIntervalMessagesProp, LONG, Defaults.LogFlushIntervalMessages, atLeast(1), HIGH, LogFlushIntervalMessagesDoc)
      .define(LogDeleteDelayMsProp, LONG, Defaults.LogDeleteDelayMs, atLeast(0), HIGH, LogDeleteDelayMsDoc)
      .define(LogFlushSchedulerIntervalMsProp, LONG, Defaults.LogFlushSchedulerIntervalMs, HIGH, LogFlushSchedulerIntervalMsDoc)
      .define(LogFlushIntervalMsProp, LONG, null, HIGH, LogFlushIntervalMsDoc)
      .define(LogFlushOffsetCheckpointIntervalMsProp, INT, Defaults.LogFlushOffsetCheckpointIntervalMs, atLeast(0), HIGH, LogFlushOffsetCheckpointIntervalMsDoc)
      .define(LogFlushStartOffsetCheckpointIntervalMsProp, INT, Defaults.LogFlushStartOffsetCheckpointIntervalMs, atLeast(0), HIGH, LogFlushStartOffsetCheckpointIntervalMsDoc)
      .define(LogPreAllocateProp, BOOLEAN, Defaults.LogPreAllocateEnable, MEDIUM, LogPreAllocateEnableDoc)
      .define(NumRecoveryThreadsPerDataDirProp, INT, Defaults.NumRecoveryThreadsPerDataDir, atLeast(1), HIGH, NumRecoveryThreadsPerDataDirDoc)
      .define(AutoCreateTopicsEnableProp, BOOLEAN, Defaults.AutoCreateTopicsEnable, HIGH, AutoCreateTopicsEnableDoc)
      .define(MinInSyncReplicasProp, INT, Defaults.MinInSyncReplicas, atLeast(1), HIGH, MinInSyncReplicasDoc)
      .define(LogMessageFormatVersionProp, STRING, Defaults.LogMessageFormatVersion, ApiVersionValidator, MEDIUM, LogMessageFormatVersionDoc)
      .define(LogMessageTimestampTypeProp, STRING, Defaults.LogMessageTimestampType, in("CreateTime", "LogAppendTime"), MEDIUM, LogMessageTimestampTypeDoc)
      .define(LogMessageTimestampDifferenceMaxMsProp, LONG, Defaults.LogMessageTimestampDifferenceMaxMs, MEDIUM, LogMessageTimestampDifferenceMaxMsDoc)
      .define(CreateTopicPolicyClassNameProp, CLASS, null, LOW, CreateTopicPolicyClassNameDoc)
      .define(AlterConfigPolicyClassNameProp, CLASS, null, LOW, AlterConfigPolicyClassNameDoc)
      .define(LogMessageDownConversionEnableProp, BOOLEAN, Defaults.MessageDownConversionEnable, LOW, LogMessageDownConversionEnableDoc)

      /** ********* Replication configuration ***********/
      .define(ControllerSocketTimeoutMsProp, INT, Defaults.ControllerSocketTimeoutMs, MEDIUM, ControllerSocketTimeoutMsDoc)
      .define(DefaultReplicationFactorProp, INT, Defaults.DefaultReplicationFactor, MEDIUM, DefaultReplicationFactorDoc)
      .define(ReplicaLagTimeMaxMsProp, LONG, Defaults.ReplicaLagTimeMaxMs, HIGH, ReplicaLagTimeMaxMsDoc)
      .define(ReplicaSocketTimeoutMsProp, INT, Defaults.ReplicaSocketTimeoutMs, HIGH, ReplicaSocketTimeoutMsDoc)
      .define(ReplicaSocketReceiveBufferBytesProp, INT, Defaults.ReplicaSocketReceiveBufferBytes, HIGH, ReplicaSocketReceiveBufferBytesDoc)
      .define(ReplicaFetchMaxBytesProp, INT, Defaults.ReplicaFetchMaxBytes, atLeast(0), MEDIUM, ReplicaFetchMaxBytesDoc)
      .define(ReplicaFetchWaitMaxMsProp, INT, Defaults.ReplicaFetchWaitMaxMs, HIGH, ReplicaFetchWaitMaxMsDoc)
      .define(ReplicaFetchBackoffMsProp, INT, Defaults.ReplicaFetchBackoffMs, atLeast(0), MEDIUM, ReplicaFetchBackoffMsDoc)
      .define(ReplicaFetchMinBytesProp, INT, Defaults.ReplicaFetchMinBytes, HIGH, ReplicaFetchMinBytesDoc)
      .define(ReplicaFetchResponseMaxBytesProp, INT, Defaults.ReplicaFetchResponseMaxBytes, atLeast(0), MEDIUM, ReplicaFetchResponseMaxBytesDoc)
      .define(NumReplicaFetchersProp, INT, Defaults.NumReplicaFetchers, HIGH, NumReplicaFetchersDoc)
      .define(ReplicaHighWatermarkCheckpointIntervalMsProp, LONG, Defaults.ReplicaHighWatermarkCheckpointIntervalMs, HIGH, ReplicaHighWatermarkCheckpointIntervalMsDoc)
      .define(FetchPurgatoryPurgeIntervalRequestsProp, INT, Defaults.FetchPurgatoryPurgeIntervalRequests, MEDIUM, FetchPurgatoryPurgeIntervalRequestsDoc)
      .define(ProducerPurgatoryPurgeIntervalRequestsProp, INT, Defaults.ProducerPurgatoryPurgeIntervalRequests, MEDIUM, ProducerPurgatoryPurgeIntervalRequestsDoc)
      .define(DeleteRecordsPurgatoryPurgeIntervalRequestsProp, INT, Defaults.DeleteRecordsPurgatoryPurgeIntervalRequests, MEDIUM, DeleteRecordsPurgatoryPurgeIntervalRequestsDoc)
      .define(AutoLeaderRebalanceEnableProp, BOOLEAN, Defaults.AutoLeaderRebalanceEnable, HIGH, AutoLeaderRebalanceEnableDoc)
      .define(LeaderImbalancePerBrokerPercentageProp, INT, Defaults.LeaderImbalancePerBrokerPercentage, HIGH, LeaderImbalancePerBrokerPercentageDoc)
      .define(LeaderImbalanceCheckIntervalSecondsProp, LONG, Defaults.LeaderImbalanceCheckIntervalSeconds, HIGH, LeaderImbalanceCheckIntervalSecondsDoc)
      .define(UncleanLeaderElectionEnableProp, BOOLEAN, Defaults.UncleanLeaderElectionEnable, HIGH, UncleanLeaderElectionEnableDoc)
      .define(InterBrokerSecurityProtocolProp, STRING, Defaults.InterBrokerSecurityProtocol, MEDIUM, InterBrokerSecurityProtocolDoc)
      .define(InterBrokerProtocolVersionProp, STRING, Defaults.InterBrokerProtocolVersion, ApiVersionValidator, MEDIUM, InterBrokerProtocolVersionDoc)
      .define(InterBrokerListenerNameProp, STRING, null, MEDIUM, InterBrokerListenerNameDoc)
      .define(ReplicaSelectorClassProp, STRING, null, MEDIUM, ReplicaSelectorClassDoc)

      /** ********* Controlled shutdown configuration ***********/
      .define(ControlledShutdownMaxRetriesProp, INT, Defaults.ControlledShutdownMaxRetries, MEDIUM, ControlledShutdownMaxRetriesDoc)
      .define(ControlledShutdownRetryBackoffMsProp, LONG, Defaults.ControlledShutdownRetryBackoffMs, MEDIUM, ControlledShutdownRetryBackoffMsDoc)
      .define(ControlledShutdownEnableProp, BOOLEAN, Defaults.ControlledShutdownEnable, MEDIUM, ControlledShutdownEnableDoc)

      /** ********* Group coordinator configuration ***********/
      .define(GroupMinSessionTimeoutMsProp, INT, Defaults.GroupMinSessionTimeoutMs, MEDIUM, GroupMinSessionTimeoutMsDoc)
      .define(GroupMaxSessionTimeoutMsProp, INT, Defaults.GroupMaxSessionTimeoutMs, MEDIUM, GroupMaxSessionTimeoutMsDoc)
      .define(GroupInitialRebalanceDelayMsProp, INT, Defaults.GroupInitialRebalanceDelayMs, MEDIUM, GroupInitialRebalanceDelayMsDoc)
      .define(GroupMaxSizeProp, INT, Defaults.GroupMaxSize, atLeast(1), MEDIUM, GroupMaxSizeDoc)

      /** ********* Offset management configuration ***********/
      .define(OffsetMetadataMaxSizeProp, INT, Defaults.OffsetMetadataMaxSize, HIGH, OffsetMetadataMaxSizeDoc)
      .define(OffsetsLoadBufferSizeProp, INT, Defaults.OffsetsLoadBufferSize, atLeast(1), HIGH, OffsetsLoadBufferSizeDoc)
      .define(OffsetsTopicReplicationFactorProp, SHORT, Defaults.OffsetsTopicReplicationFactor, atLeast(1), HIGH, OffsetsTopicReplicationFactorDoc)
      .define(OffsetsTopicPartitionsProp, INT, Defaults.OffsetsTopicPartitions, atLeast(1), HIGH, OffsetsTopicPartitionsDoc)
      .define(OffsetsTopicSegmentBytesProp, INT, Defaults.OffsetsTopicSegmentBytes, atLeast(1), HIGH, OffsetsTopicSegmentBytesDoc)
      .define(OffsetsTopicCompressionCodecProp, INT, Defaults.OffsetsTopicCompressionCodec, HIGH, OffsetsTopicCompressionCodecDoc)
      .define(OffsetsRetentionMinutesProp, INT, Defaults.OffsetsRetentionMinutes, atLeast(1), HIGH, OffsetsRetentionMinutesDoc)
      .define(OffsetsRetentionCheckIntervalMsProp, LONG, Defaults.OffsetsRetentionCheckIntervalMs, atLeast(1), HIGH, OffsetsRetentionCheckIntervalMsDoc)
      .define(OffsetCommitTimeoutMsProp, INT, Defaults.OffsetCommitTimeoutMs, atLeast(1), HIGH, OffsetCommitTimeoutMsDoc)
      .define(OffsetCommitRequiredAcksProp, SHORT, Defaults.OffsetCommitRequiredAcks, HIGH, OffsetCommitRequiredAcksDoc)
      .define(DeleteTopicEnableProp, BOOLEAN, Defaults.DeleteTopicEnable, HIGH, DeleteTopicEnableDoc)
      .define(CompressionTypeProp, STRING, Defaults.CompressionType, HIGH, CompressionTypeDoc)

      /** ********* Transaction management configuration ***********/
      .define(TransactionalIdExpirationMsProp, INT, Defaults.TransactionalIdExpirationMs, atLeast(1), HIGH, TransactionalIdExpirationMsDoc)
      .define(TransactionsMaxTimeoutMsProp, INT, Defaults.TransactionsMaxTimeoutMs, atLeast(1), HIGH, TransactionsMaxTimeoutMsDoc)
      .define(TransactionsTopicMinISRProp, INT, Defaults.TransactionsTopicMinISR, atLeast(1), HIGH, TransactionsTopicMinISRDoc)
      .define(TransactionsLoadBufferSizeProp, INT, Defaults.TransactionsLoadBufferSize, atLeast(1), HIGH, TransactionsLoadBufferSizeDoc)
      .define(TransactionsTopicReplicationFactorProp, SHORT, Defaults.TransactionsTopicReplicationFactor, atLeast(1), HIGH, TransactionsTopicReplicationFactorDoc)
      .define(TransactionsTopicPartitionsProp, INT, Defaults.TransactionsTopicPartitions, atLeast(1), HIGH, TransactionsTopicPartitionsDoc)
      .define(TransactionsTopicSegmentBytesProp, INT, Defaults.TransactionsTopicSegmentBytes, atLeast(1), HIGH, TransactionsTopicSegmentBytesDoc)
      .define(TransactionsAbortTimedOutTransactionCleanupIntervalMsProp, INT, Defaults.TransactionsAbortTimedOutTransactionsCleanupIntervalMS, atLeast(1), LOW, TransactionsAbortTimedOutTransactionsIntervalMsDoc)
      .define(TransactionsRemoveExpiredTransactionalIdCleanupIntervalMsProp, INT, Defaults.TransactionsRemoveExpiredTransactionsCleanupIntervalMS, atLeast(1), LOW, TransactionsRemoveExpiredTransactionsIntervalMsDoc)

      /** ********* Fetch Configuration **************/
      .define(MaxIncrementalFetchSessionCacheSlots, INT, Defaults.MaxIncrementalFetchSessionCacheSlots, atLeast(0), MEDIUM, MaxIncrementalFetchSessionCacheSlotsDoc)
      .define(FetchMaxBytes, INT, Defaults.FetchMaxBytes, atLeast(1024), MEDIUM, FetchMaxBytesDoc)

      /** ********* Kafka Metrics Configuration ***********/
      .define(MetricNumSamplesProp, INT, Defaults.MetricNumSamples, atLeast(1), LOW, MetricNumSamplesDoc)
      .define(MetricSampleWindowMsProp, LONG, Defaults.MetricSampleWindowMs, atLeast(1), LOW, MetricSampleWindowMsDoc)
      .define(MetricReporterClassesProp, LIST, Defaults.MetricReporterClasses, LOW, MetricReporterClassesDoc)
      .define(MetricRecordingLevelProp, STRING, Defaults.MetricRecordingLevel, LOW, MetricRecordingLevelDoc)

      /** ********* Kafka Yammer Metrics Reporter Configuration for docs ***********/
      .define(KafkaMetricsReporterClassesProp, LIST, Defaults.KafkaMetricReporterClasses, LOW, KafkaMetricsReporterClassesDoc)
      .define(KafkaMetricsPollingIntervalSecondsProp, INT, Defaults.KafkaMetricsPollingIntervalSeconds, atLeast(1), LOW, KafkaMetricsPollingIntervalSecondsDoc)

      /** ********* Quota configuration ***********/
      .define(ProducerQuotaBytesPerSecondDefaultProp, LONG, Defaults.ProducerQuotaBytesPerSecondDefault, atLeast(1), HIGH, ProducerQuotaBytesPerSecondDefaultDoc)
      .define(ConsumerQuotaBytesPerSecondDefaultProp, LONG, Defaults.ConsumerQuotaBytesPerSecondDefault, atLeast(1), HIGH, ConsumerQuotaBytesPerSecondDefaultDoc)
      .define(NumQuotaSamplesProp, INT, Defaults.NumQuotaSamples, atLeast(1), LOW, NumQuotaSamplesDoc)
      .define(NumReplicationQuotaSamplesProp, INT, Defaults.NumReplicationQuotaSamples, atLeast(1), LOW, NumReplicationQuotaSamplesDoc)
      .define(NumAlterLogDirsReplicationQuotaSamplesProp, INT, Defaults.NumAlterLogDirsReplicationQuotaSamples, atLeast(1), LOW, NumAlterLogDirsReplicationQuotaSamplesDoc)
      .define(NumControllerQuotaSamplesProp, INT, Defaults.NumControllerQuotaSamples, atLeast(1), LOW, NumControllerQuotaSamplesDoc)
      .define(QuotaWindowSizeSecondsProp, INT, Defaults.QuotaWindowSizeSeconds, atLeast(1), LOW, QuotaWindowSizeSecondsDoc)
      .define(ReplicationQuotaWindowSizeSecondsProp, INT, Defaults.ReplicationQuotaWindowSizeSeconds, atLeast(1), LOW, ReplicationQuotaWindowSizeSecondsDoc)
      .define(AlterLogDirsReplicationQuotaWindowSizeSecondsProp, INT, Defaults.AlterLogDirsReplicationQuotaWindowSizeSeconds, atLeast(1), LOW, AlterLogDirsReplicationQuotaWindowSizeSecondsDoc)
      .define(ControllerQuotaWindowSizeSecondsProp, INT, Defaults.ControllerQuotaWindowSizeSeconds, atLeast(1), LOW, ControllerQuotaWindowSizeSecondsDoc)
      .define(ClientQuotaCallbackClassProp, CLASS, null, LOW, ClientQuotaCallbackClassDoc)

      /** ********* General Security Configuration ****************/
      .define(ConnectionsMaxReauthMsProp, LONG, Defaults.ConnectionsMaxReauthMsDefault, MEDIUM, ConnectionsMaxReauthMsDoc)
      .define(securityProviderClassProp, STRING, null, LOW, securityProviderClassDoc)

      /** ********* SSL Configuration ****************/
      .define(PrincipalBuilderClassProp, CLASS, null, MEDIUM, PrincipalBuilderClassDoc)
      .define(SslProtocolProp, STRING, Defaults.SslProtocol, MEDIUM, SslProtocolDoc)
      .define(SslProviderProp, STRING, null, MEDIUM, SslProviderDoc)
      .define(SslEnabledProtocolsProp, LIST, Defaults.SslEnabledProtocols, MEDIUM, SslEnabledProtocolsDoc)
      .define(SslKeystoreTypeProp, STRING, Defaults.SslKeystoreType, MEDIUM, SslKeystoreTypeDoc)
      .define(SslKeystoreLocationProp, STRING, null, MEDIUM, SslKeystoreLocationDoc)
      .define(SslKeystorePasswordProp, PASSWORD, null, MEDIUM, SslKeystorePasswordDoc)
      .define(SslKeyPasswordProp, PASSWORD, null, MEDIUM, SslKeyPasswordDoc)
      .define(SslKeystoreKeyProp, PASSWORD, null, MEDIUM, SslKeystoreKeyDoc)
      .define(SslKeystoreCertificateChainProp, PASSWORD, null, MEDIUM, SslKeystoreCertificateChainDoc)
      .define(SslTruststoreTypeProp, STRING, Defaults.SslTruststoreType, MEDIUM, SslTruststoreTypeDoc)
      .define(SslTruststoreLocationProp, STRING, null, MEDIUM, SslTruststoreLocationDoc)
      .define(SslTruststorePasswordProp, PASSWORD, null, MEDIUM, SslTruststorePasswordDoc)
      .define(SslTruststoreCertificatesProp, PASSWORD, null, MEDIUM, SslTruststoreCertificatesDoc)
      .define(SslKeyManagerAlgorithmProp, STRING, Defaults.SslKeyManagerAlgorithm, MEDIUM, SslKeyManagerAlgorithmDoc)
      .define(SslTrustManagerAlgorithmProp, STRING, Defaults.SslTrustManagerAlgorithm, MEDIUM, SslTrustManagerAlgorithmDoc)
      .define(SslEndpointIdentificationAlgorithmProp, STRING, Defaults.SslEndpointIdentificationAlgorithm, LOW, SslEndpointIdentificationAlgorithmDoc)
      .define(SslSecureRandomImplementationProp, STRING, null, LOW, SslSecureRandomImplementationDoc)
      .define(SslClientAuthProp, STRING, Defaults.SslClientAuthentication, in(Defaults.SslClientAuthenticationValidValues:_*), MEDIUM, SslClientAuthDoc)
      .define(SslCipherSuitesProp, LIST, Collections.emptyList(), MEDIUM, SslCipherSuitesDoc)
      .define(SslPrincipalMappingRulesProp, STRING, Defaults.SslPrincipalMappingRules, LOW, SslPrincipalMappingRulesDoc)
      .define(SslEngineFactoryClassProp, CLASS, null, LOW, SslEngineFactoryClassDoc)

      /** ********* Sasl Configuration ****************/
      .define(SaslMechanismInterBrokerProtocolProp, STRING, Defaults.SaslMechanismInterBrokerProtocol, MEDIUM, SaslMechanismInterBrokerProtocolDoc)
      .define(SaslJaasConfigProp, PASSWORD, null, MEDIUM, SaslJaasConfigDoc)
      .define(SaslEnabledMechanismsProp, LIST, Defaults.SaslEnabledMechanisms, MEDIUM, SaslEnabledMechanismsDoc)
      .define(SaslServerCallbackHandlerClassProp, CLASS, null, MEDIUM, SaslServerCallbackHandlerClassDoc)
      .define(SaslClientCallbackHandlerClassProp, CLASS, null, MEDIUM, SaslClientCallbackHandlerClassDoc)
      .define(SaslLoginClassProp, CLASS, null, MEDIUM, SaslLoginClassDoc)
      .define(SaslLoginCallbackHandlerClassProp, CLASS, null, MEDIUM, SaslLoginCallbackHandlerClassDoc)
      .define(SaslKerberosServiceNameProp, STRING, null, MEDIUM, SaslKerberosServiceNameDoc)
      .define(SaslKerberosKinitCmdProp, STRING, Defaults.SaslKerberosKinitCmd, MEDIUM, SaslKerberosKinitCmdDoc)
      .define(SaslKerberosTicketRenewWindowFactorProp, DOUBLE, Defaults.SaslKerberosTicketRenewWindowFactor, MEDIUM, SaslKerberosTicketRenewWindowFactorDoc)
      .define(SaslKerberosTicketRenewJitterProp, DOUBLE, Defaults.SaslKerberosTicketRenewJitter, MEDIUM, SaslKerberosTicketRenewJitterDoc)
      .define(SaslKerberosMinTimeBeforeReloginProp, LONG, Defaults.SaslKerberosMinTimeBeforeRelogin, MEDIUM, SaslKerberosMinTimeBeforeReloginDoc)
      .define(SaslKerberosPrincipalToLocalRulesProp, LIST, Defaults.SaslKerberosPrincipalToLocalRules, MEDIUM, SaslKerberosPrincipalToLocalRulesDoc)
      .define(SaslLoginRefreshWindowFactorProp, DOUBLE, Defaults.SaslLoginRefreshWindowFactor, MEDIUM, SaslLoginRefreshWindowFactorDoc)
      .define(SaslLoginRefreshWindowJitterProp, DOUBLE, Defaults.SaslLoginRefreshWindowJitter, MEDIUM, SaslLoginRefreshWindowJitterDoc)
      .define(SaslLoginRefreshMinPeriodSecondsProp, SHORT, Defaults.SaslLoginRefreshMinPeriodSeconds, MEDIUM, SaslLoginRefreshMinPeriodSecondsDoc)
      .define(SaslLoginRefreshBufferSecondsProp, SHORT, Defaults.SaslLoginRefreshBufferSeconds, MEDIUM, SaslLoginRefreshBufferSecondsDoc)
      /** ********* Delegation Token Configuration ****************/
      .define(DelegationTokenSecretKeyProp, PASSWORD, MEDIUM, DelegationTokenSecretKeyDoc)
      .define(DelegationTokenMaxLifeTimeProp, LONG, Defaults.DelegationTokenMaxLifeTimeMsDefault, atLeast(1), MEDIUM, DelegationTokenMaxLifeTimeDoc)
      .define(DelegationTokenExpiryTimeMsProp, LONG, Defaults.DelegationTokenExpiryTimeMsDefault, atLeast(1), MEDIUM, DelegationTokenExpiryTimeMsDoc)
      .define(DelegationTokenExpiryCheckIntervalMsProp, LONG, Defaults.DelegationTokenExpiryCheckIntervalMsDefault, atLeast(1), LOW, DelegationTokenExpiryCheckIntervalDoc)

      /** ********* Password encryption configuration for dynamic configs *********/
      .define(PasswordEncoderSecretProp, PASSWORD, null, MEDIUM, PasswordEncoderSecretDoc)
      .define(PasswordEncoderOldSecretProp, PASSWORD, null, MEDIUM, PasswordEncoderOldSecretDoc)
      .define(PasswordEncoderKeyFactoryAlgorithmProp, STRING, null, LOW, PasswordEncoderKeyFactoryAlgorithmDoc)
      .define(PasswordEncoderCipherAlgorithmProp, STRING, Defaults.PasswordEncoderCipherAlgorithm, LOW, PasswordEncoderCipherAlgorithmDoc)
      .define(PasswordEncoderKeyLengthProp, INT, Defaults.PasswordEncoderKeyLength, atLeast(8), LOW, PasswordEncoderKeyLengthDoc)
      .define(PasswordEncoderIterationsProp, INT, Defaults.PasswordEncoderIterations, atLeast(1024), LOW, PasswordEncoderIterationsDoc)

      /** ********* Raft Quorum Configuration *********/
      .defineInternal(RaftConfig.QUORUM_VOTERS_CONFIG, LIST, Defaults.QuorumVoters, new RaftConfig.ControllerQuorumVotersValidator(), HIGH, RaftConfig.QUORUM_VOTERS_DOC)
      .defineInternal(RaftConfig.QUORUM_ELECTION_TIMEOUT_MS_CONFIG, INT, Defaults.QuorumElectionTimeoutMs, null, HIGH, RaftConfig.QUORUM_ELECTION_TIMEOUT_MS_DOC)
      .defineInternal(RaftConfig.QUORUM_FETCH_TIMEOUT_MS_CONFIG, INT, Defaults.QuorumFetchTimeoutMs, null, HIGH, RaftConfig.QUORUM_FETCH_TIMEOUT_MS_DOC)
      .defineInternal(RaftConfig.QUORUM_ELECTION_BACKOFF_MAX_MS_CONFIG, INT, Defaults.QuorumElectionBackoffMs, null, HIGH, RaftConfig.QUORUM_ELECTION_BACKOFF_MAX_MS_DOC)
      .defineInternal(RaftConfig.QUORUM_LINGER_MS_CONFIG, INT, Defaults.QuorumLingerMs, null, MEDIUM, RaftConfig.QUORUM_LINGER_MS_DOC)
      .defineInternal(RaftConfig.QUORUM_REQUEST_TIMEOUT_MS_CONFIG, INT, Defaults.QuorumRequestTimeoutMs, null, MEDIUM, RaftConfig.QUORUM_REQUEST_TIMEOUT_MS_DOC)
      .defineInternal(RaftConfig.QUORUM_RETRY_BACKOFF_MS_CONFIG, INT, Defaults.QuorumRetryBackoffMs, null, LOW, RaftConfig.QUORUM_RETRY_BACKOFF_MS_DOC)
  }

  def configNames: Seq[String] = configDef.names.asScala.toBuffer.sorted
  private[server] def defaultValues: Map[String, _] = configDef.defaultValues.asScala
  private[server] def configKeys: Map[String, ConfigKey] = configDef.configKeys.asScala

  def fromProps(props: Properties): KafkaConfig =
    fromProps(props, true)

  def fromProps(props: Properties, doLog: Boolean): KafkaConfig =
    new KafkaConfig(props, doLog)

  def fromProps(defaults: Properties, overrides: Properties): KafkaConfig =
    fromProps(defaults, overrides, true)

  def fromProps(defaults: Properties, overrides: Properties, doLog: Boolean): KafkaConfig = {
    val props = new Properties()
    props ++= defaults
    props ++= overrides
    fromProps(props, doLog)
  }

  def apply(props: java.util.Map[_, _]): KafkaConfig = new KafkaConfig(props, true)

  private def typeOf(name: String): Option[ConfigDef.Type] = Option(configDef.configKeys.get(name)).map(_.`type`)

  def configType(configName: String): Option[ConfigDef.Type] = {
    val configType = configTypeExact(configName)
    if (configType.isDefined) {
      return configType
    }
    typeOf(configName) match {
      case Some(t) => Some(t)
      case None =>
        DynamicBrokerConfig.brokerConfigSynonyms(configName, matchListenerOverride = true).flatMap(typeOf).headOption
    }
  }

  private def configTypeExact(exactName: String): Option[ConfigDef.Type] = {
    val configType = typeOf(exactName).orNull
    if (configType != null) {
      Some(configType)
    } else {
      val configKey = DynamicConfig.Broker.brokerConfigDef.configKeys().get(exactName)
      if (configKey != null) {
        Some(configKey.`type`)
      } else {
        None
      }
    }
  }

  def maybeSensitive(configType: Option[ConfigDef.Type]): Boolean = {
    // If we can't determine the config entry type, treat it as a sensitive config to be safe
    configType.isEmpty || configType.contains(ConfigDef.Type.PASSWORD)
  }

  def loggableValue(resourceType: ConfigResource.Type, name: String, value: String): String = {
    val maybeSensitive = resourceType match {
      case ConfigResource.Type.BROKER => KafkaConfig.maybeSensitive(KafkaConfig.configType(name))
      case ConfigResource.Type.TOPIC => KafkaConfig.maybeSensitive(LogConfig.configType(name))
      case ConfigResource.Type.BROKER_LOGGER => false
      case _ => true
    }
    if (maybeSensitive) Password.HIDDEN else value
  }
}

class KafkaConfig(val props: java.util.Map[_, _], doLog: Boolean, dynamicConfigOverride: Option[DynamicBrokerConfig])
  extends AbstractConfig(KafkaConfig.configDef, props, doLog) {

  def this(props: java.util.Map[_, _]) = this(props, true, None)
  def this(props: java.util.Map[_, _], doLog: Boolean) = this(props, doLog, None)
  // Cache the current config to avoid acquiring read lock to access from dynamicConfig
  @volatile private var currentConfig = this
  private[server] val dynamicConfig = dynamicConfigOverride.getOrElse(new DynamicBrokerConfig(this))

  private[server] def updateCurrentConfig(newConfig: KafkaConfig): Unit = {
    this.currentConfig = newConfig
  }

  // The following captures any system properties impacting ZooKeeper TLS configuration
  // and defines the default values this instance will use if no explicit config is given.
  // We make it part of each instance rather than the object to facilitate testing.
  private val zkClientConfigViaSystemProperties = new ZKClientConfig()

  override def originals: util.Map[String, AnyRef] =
    if (this eq currentConfig) super.originals else currentConfig.originals
  override def values: util.Map[String, _] =
    if (this eq currentConfig) super.values else currentConfig.values
  override def nonInternalValues: util.Map[String, _] =
    if (this eq currentConfig) super.nonInternalValues else currentConfig.values
  override def originalsStrings: util.Map[String, String] =
    if (this eq currentConfig) super.originalsStrings else currentConfig.originalsStrings
  override def originalsWithPrefix(prefix: String): util.Map[String, AnyRef] =
    if (this eq currentConfig) super.originalsWithPrefix(prefix) else currentConfig.originalsWithPrefix(prefix)
  override def valuesWithPrefixOverride(prefix: String): util.Map[String, AnyRef] =
    if (this eq currentConfig) super.valuesWithPrefixOverride(prefix) else currentConfig.valuesWithPrefixOverride(prefix)
  override def get(key: String): AnyRef =
    if (this eq currentConfig) super.get(key) else currentConfig.get(key)

  //  During dynamic update, we use the values from this config, these are only used in DynamicBrokerConfig
  private[server] def originalsFromThisConfig: util.Map[String, AnyRef] = super.originals
  private[server] def valuesFromThisConfig: util.Map[String, _] = super.values
  private[server] def valuesFromThisConfigWithPrefixOverride(prefix: String): util.Map[String, AnyRef] =
    super.valuesWithPrefixOverride(prefix)

  /** ********* Zookeeper Configuration ***********/
  val zkConnect: String = getString(KafkaConfig.ZkConnectProp)
  val zkSessionTimeoutMs: Int = getInt(KafkaConfig.ZkSessionTimeoutMsProp)
  val zkConnectionTimeoutMs: Int =
    Option(getInt(KafkaConfig.ZkConnectionTimeoutMsProp)).map(_.toInt).getOrElse(getInt(KafkaConfig.ZkSessionTimeoutMsProp))
  val zkSyncTimeMs: Int = getInt(KafkaConfig.ZkSyncTimeMsProp)
  val zkEnableSecureAcls: Boolean = getBoolean(KafkaConfig.ZkEnableSecureAclsProp)
  val zkMaxInFlightRequests: Int = getInt(KafkaConfig.ZkMaxInFlightRequestsProp)

  private def zkBooleanConfigOrSystemPropertyWithDefaultValue(propKey: String): Boolean = {
    // Use the system property if it exists and the Kafka config value was defaulted rather than actually provided
    // Need to translate any system property value from true/false (String) to true/false (Boolean)
    val actuallyProvided = originals.containsKey(propKey)
    if (actuallyProvided) getBoolean(propKey) else {
      val sysPropValue = KafkaConfig.getZooKeeperClientProperty(zkClientConfigViaSystemProperties, propKey)
      sysPropValue match {
        case Some("true") => true
        case Some(_) => false
        case _ => getBoolean(propKey) // not specified so use the default value
      }
    }
  }

  private def zkStringConfigOrSystemPropertyWithDefaultValue(propKey: String): String = {
    // Use the system property if it exists and the Kafka config value was defaulted rather than actually provided
    val actuallyProvided = originals.containsKey(propKey)
    if (actuallyProvided) getString(propKey) else {
      val sysPropValue = KafkaConfig.getZooKeeperClientProperty(zkClientConfigViaSystemProperties, propKey)
      sysPropValue match {
        case Some(_) => sysPropValue.get
        case _ => getString(propKey) // not specified so use the default value
      }
    }
  }

  private def zkOptionalStringConfigOrSystemProperty(propKey: String): Option[String] = {
    Option(getString(propKey)) match {
      case config: Some[String] => config
      case _ => KafkaConfig.getZooKeeperClientProperty(zkClientConfigViaSystemProperties, propKey)
    }
  }
  private def zkPasswordConfigOrSystemProperty(propKey: String): Option[Password] = {
    Option(getPassword(propKey)) match {
      case config: Some[Password] => config
      case _ => {
        val sysProp = KafkaConfig.getZooKeeperClientProperty (zkClientConfigViaSystemProperties, propKey)
        if (sysProp.isDefined) Some (new Password (sysProp.get) ) else None
      }
    }
  }
  private def zkListConfigOrSystemProperty(propKey: String): Option[util.List[String]] = {
    Option(getList(propKey)) match {
      case config: Some[util.List[String]] => config
      case _ => {
        val sysProp = KafkaConfig.getZooKeeperClientProperty(zkClientConfigViaSystemProperties, propKey)
        if (sysProp.isDefined) Some(sysProp.get.split("\\s*,\\s*").toList.asJava) else None
      }
    }
  }

  val zkSslClientEnable = zkBooleanConfigOrSystemPropertyWithDefaultValue(KafkaConfig.ZkSslClientEnableProp)
  val zkClientCnxnSocketClassName = zkOptionalStringConfigOrSystemProperty(KafkaConfig.ZkClientCnxnSocketProp)
  val zkSslKeyStoreLocation = zkOptionalStringConfigOrSystemProperty(KafkaConfig.ZkSslKeyStoreLocationProp)
  val zkSslKeyStorePassword = zkPasswordConfigOrSystemProperty(KafkaConfig.ZkSslKeyStorePasswordProp)
  val zkSslKeyStoreType = zkOptionalStringConfigOrSystemProperty(KafkaConfig.ZkSslKeyStoreTypeProp)
  val zkSslTrustStoreLocation = zkOptionalStringConfigOrSystemProperty(KafkaConfig.ZkSslTrustStoreLocationProp)
  val zkSslTrustStorePassword = zkPasswordConfigOrSystemProperty(KafkaConfig.ZkSslTrustStorePasswordProp)
  val zkSslTrustStoreType = zkOptionalStringConfigOrSystemProperty(KafkaConfig.ZkSslTrustStoreTypeProp)
  val ZkSslProtocol = zkStringConfigOrSystemPropertyWithDefaultValue(KafkaConfig.ZkSslProtocolProp)
  val ZkSslEnabledProtocols = zkListConfigOrSystemProperty(KafkaConfig.ZkSslEnabledProtocolsProp)
  val ZkSslCipherSuites = zkListConfigOrSystemProperty(KafkaConfig.ZkSslCipherSuitesProp)
  val ZkSslEndpointIdentificationAlgorithm = {
    // Use the system property if it exists and the Kafka config value was defaulted rather than actually provided
    // Need to translate any system property value from true/false to HTTPS/<blank>
    val kafkaProp = KafkaConfig.ZkSslEndpointIdentificationAlgorithmProp
    val actuallyProvided = originals.containsKey(kafkaProp)
    if (actuallyProvided) getString(kafkaProp) else {
      val sysPropValue = KafkaConfig.getZooKeeperClientProperty(zkClientConfigViaSystemProperties, kafkaProp)
      sysPropValue match {
        case Some("true") => "HTTPS"
        case Some(_) => ""
        case _ => getString(kafkaProp) // not specified so use the default value
      }
    }
  }
  val ZkSslCrlEnable = zkBooleanConfigOrSystemPropertyWithDefaultValue(KafkaConfig.ZkSslCrlEnableProp)
  val ZkSslOcspEnable = zkBooleanConfigOrSystemPropertyWithDefaultValue(KafkaConfig.ZkSslOcspEnableProp)
  /** ********* General Configuration ***********/
  val brokerIdGenerationEnable: Boolean = getBoolean(KafkaConfig.BrokerIdGenerationEnableProp)
  val maxReservedBrokerId: Int = getInt(KafkaConfig.MaxReservedBrokerIdProp)
  var brokerId: Int = {
    val nodeId = getInt(KafkaConfig.NodeIdProp)
    if (nodeId < 0) {
      getInt(KafkaConfig.BrokerIdProp)
    } else {
      nodeId
    }
  }
  val nodeId: Int = brokerId
  val processRoles: Set[ProcessRole] = parseProcessRoles()
  val initialRegistrationTimeoutMs: Int = getInt(KafkaConfig.InitialBrokerRegistrationTimeoutMsProp)
  val brokerHeartbeatIntervalMs: Int = getInt(KafkaConfig.BrokerHeartbeatIntervalMsProp)
  val brokerSessionTimeoutMs: Int = getInt(KafkaConfig.BrokerSessionTimeoutMsProp)

  def requiresZookeeper: Boolean = processRoles.isEmpty
  def usesSelfManagedQuorum: Boolean = processRoles.nonEmpty

  private def parseProcessRoles(): Set[ProcessRole] = {
    val roles = getList(KafkaConfig.ProcessRolesProp).asScala.map {
      case "broker" => BrokerRole
      case "controller" => ControllerRole
      case role => throw new ConfigException(s"Unknown process role '$role'" +
        " (only 'broker' and 'controller' are allowed roles)")
    }

    val distinctRoles: Set[ProcessRole] = roles.toSet

    if (distinctRoles.size != roles.size) {
      throw new ConfigException(s"Duplicate role names found in `${KafkaConfig.ProcessRolesProp}`: $roles")
    }

    distinctRoles
  }

  def metadataLogDir: String = {
    Option(getString(KafkaConfig.MetadataLogDirProp)) match {
      case Some(dir) => dir
      case None => logDirs.head
    }
  }

  def numNetworkThreads = getInt(KafkaConfig.NumNetworkThreadsProp)
  def backgroundThreads = getInt(KafkaConfig.BackgroundThreadsProp)
  val queuedMaxRequests = getInt(KafkaConfig.QueuedMaxRequestsProp)
  val queuedMaxBytes = getLong(KafkaConfig.QueuedMaxBytesProp)
  def numIoThreads = getInt(KafkaConfig.NumIoThreadsProp)
  def messageMaxBytes = getInt(KafkaConfig.MessageMaxBytesProp)
  val requestTimeoutMs = getInt(KafkaConfig.RequestTimeoutMsProp)
  val connectionSetupTimeoutMs = getLong(KafkaConfig.ConnectionSetupTimeoutMsProp)
  val connectionSetupTimeoutMaxMs = getLong(KafkaConfig.ConnectionSetupTimeoutMaxMsProp)

  def getNumReplicaAlterLogDirsThreads: Int = {
    val numThreads: Integer = Option(getInt(KafkaConfig.NumReplicaAlterLogDirsThreadsProp)).getOrElse(logDirs.size)
    numThreads
  }

  /************* Authorizer Configuration ***********/
  val authorizer: Option[Authorizer] = {
    val className = getString(KafkaConfig.AuthorizerClassNameProp)
    if (className == null || className.isEmpty)
      None
    else {
      Some(AuthorizerUtils.createAuthorizer(className))
    }
  }

  /** ********* Socket Server Configuration ***********/
  val hostName = getString(KafkaConfig.HostNameProp)
  val port = getInt(KafkaConfig.PortProp)
  val advertisedHostName = Option(getString(KafkaConfig.AdvertisedHostNameProp)).getOrElse(hostName)
  val advertisedPort: java.lang.Integer = Option(getInt(KafkaConfig.AdvertisedPortProp)).getOrElse(port)

  val socketSendBufferBytes = getInt(KafkaConfig.SocketSendBufferBytesProp)
  val socketReceiveBufferBytes = getInt(KafkaConfig.SocketReceiveBufferBytesProp)
  val socketRequestMaxBytes = getInt(KafkaConfig.SocketRequestMaxBytesProp)
  val maxConnectionsPerIp = getInt(KafkaConfig.MaxConnectionsPerIpProp)
  val maxConnectionsPerIpOverrides: Map[String, Int] =
    getMap(KafkaConfig.MaxConnectionsPerIpOverridesProp, getString(KafkaConfig.MaxConnectionsPerIpOverridesProp)).map { case (k, v) => (k, v.toInt)}
  def maxConnections = getInt(KafkaConfig.MaxConnectionsProp)
  def maxConnectionCreationRate = getInt(KafkaConfig.MaxConnectionCreationRateProp)
  val connectionsMaxIdleMs = getLong(KafkaConfig.ConnectionsMaxIdleMsProp)
  val failedAuthenticationDelayMs = getInt(KafkaConfig.FailedAuthenticationDelayMsProp)

  /***************** rack configuration **************/
  val rack = Option(getString(KafkaConfig.RackProp))
  val replicaSelectorClassName = Option(getString(KafkaConfig.ReplicaSelectorClassProp))

  /** ********* Log Configuration ***********/
  val autoCreateTopicsEnable = getBoolean(KafkaConfig.AutoCreateTopicsEnableProp)
  val numPartitions = getInt(KafkaConfig.NumPartitionsProp)
  val logDirs = CoreUtils.parseCsvList(Option(getString(KafkaConfig.LogDirsProp)).getOrElse(getString(KafkaConfig.LogDirProp)))
  def logSegmentBytes = getInt(KafkaConfig.LogSegmentBytesProp)
  def logFlushIntervalMessages = getLong(KafkaConfig.LogFlushIntervalMessagesProp)
  val logCleanerThreads = getInt(KafkaConfig.LogCleanerThreadsProp)
  def numRecoveryThreadsPerDataDir = getInt(KafkaConfig.NumRecoveryThreadsPerDataDirProp)
  val logFlushSchedulerIntervalMs = getLong(KafkaConfig.LogFlushSchedulerIntervalMsProp)
  val logFlushOffsetCheckpointIntervalMs = getInt(KafkaConfig.LogFlushOffsetCheckpointIntervalMsProp).toLong
  val logFlushStartOffsetCheckpointIntervalMs = getInt(KafkaConfig.LogFlushStartOffsetCheckpointIntervalMsProp).toLong
  val logCleanupIntervalMs = getLong(KafkaConfig.LogCleanupIntervalMsProp)
  def logCleanupPolicy = getList(KafkaConfig.LogCleanupPolicyProp)
  val offsetsRetentionMinutes = getInt(KafkaConfig.OffsetsRetentionMinutesProp)
  val offsetsRetentionCheckIntervalMs = getLong(KafkaConfig.OffsetsRetentionCheckIntervalMsProp)
  def logRetentionBytes = getLong(KafkaConfig.LogRetentionBytesProp)
  val logCleanerDedupeBufferSize = getLong(KafkaConfig.LogCleanerDedupeBufferSizeProp)
  val logCleanerDedupeBufferLoadFactor = getDouble(KafkaConfig.LogCleanerDedupeBufferLoadFactorProp)
  val logCleanerIoBufferSize = getInt(KafkaConfig.LogCleanerIoBufferSizeProp)
  val logCleanerIoMaxBytesPerSecond = getDouble(KafkaConfig.LogCleanerIoMaxBytesPerSecondProp)
  def logCleanerDeleteRetentionMs = getLong(KafkaConfig.LogCleanerDeleteRetentionMsProp)
  def logCleanerMinCompactionLagMs = getLong(KafkaConfig.LogCleanerMinCompactionLagMsProp)
  def logCleanerMaxCompactionLagMs = getLong(KafkaConfig.LogCleanerMaxCompactionLagMsProp)
  val logCleanerBackoffMs = getLong(KafkaConfig.LogCleanerBackoffMsProp)
  def logCleanerMinCleanRatio = getDouble(KafkaConfig.LogCleanerMinCleanRatioProp)
  val logCleanerEnable = getBoolean(KafkaConfig.LogCleanerEnableProp)
  def logIndexSizeMaxBytes = getInt(KafkaConfig.LogIndexSizeMaxBytesProp)
  def logIndexIntervalBytes = getInt(KafkaConfig.LogIndexIntervalBytesProp)
  def logDeleteDelayMs = getLong(KafkaConfig.LogDeleteDelayMsProp)
  def logRollTimeMillis: java.lang.Long = Option(getLong(KafkaConfig.LogRollTimeMillisProp)).getOrElse(60 * 60 * 1000L * getInt(KafkaConfig.LogRollTimeHoursProp))
  def logRollTimeJitterMillis: java.lang.Long = Option(getLong(KafkaConfig.LogRollTimeJitterMillisProp)).getOrElse(60 * 60 * 1000L * getInt(KafkaConfig.LogRollTimeJitterHoursProp))
  def logFlushIntervalMs: java.lang.Long = Option(getLong(KafkaConfig.LogFlushIntervalMsProp)).getOrElse(getLong(KafkaConfig.LogFlushSchedulerIntervalMsProp))
  def minInSyncReplicas = getInt(KafkaConfig.MinInSyncReplicasProp)
  def logPreAllocateEnable: java.lang.Boolean = getBoolean(KafkaConfig.LogPreAllocateProp)
  // We keep the user-provided String as `ApiVersion.apply` can choose a slightly different version (eg if `0.10.0`
  // is passed, `0.10.0-IV0` may be picked)
  val logMessageFormatVersionString = getString(KafkaConfig.LogMessageFormatVersionProp)
  val logMessageFormatVersion = ApiVersion(logMessageFormatVersionString)
  def logMessageTimestampType = TimestampType.forName(getString(KafkaConfig.LogMessageTimestampTypeProp))
  def logMessageTimestampDifferenceMaxMs: Long = getLong(KafkaConfig.LogMessageTimestampDifferenceMaxMsProp)
  def logMessageDownConversionEnable: Boolean = getBoolean(KafkaConfig.LogMessageDownConversionEnableProp)

  /** ********* Replication configuration ***********/
  val controllerSocketTimeoutMs: Int = getInt(KafkaConfig.ControllerSocketTimeoutMsProp)
  val defaultReplicationFactor: Int = getInt(KafkaConfig.DefaultReplicationFactorProp)
  val replicaLagTimeMaxMs = getLong(KafkaConfig.ReplicaLagTimeMaxMsProp)
  val replicaSocketTimeoutMs = getInt(KafkaConfig.ReplicaSocketTimeoutMsProp)
  val replicaSocketReceiveBufferBytes = getInt(KafkaConfig.ReplicaSocketReceiveBufferBytesProp)
  val replicaFetchMaxBytes = getInt(KafkaConfig.ReplicaFetchMaxBytesProp)
  val replicaFetchWaitMaxMs = getInt(KafkaConfig.ReplicaFetchWaitMaxMsProp)
  val replicaFetchMinBytes = getInt(KafkaConfig.ReplicaFetchMinBytesProp)
  val replicaFetchResponseMaxBytes = getInt(KafkaConfig.ReplicaFetchResponseMaxBytesProp)
  val replicaFetchBackoffMs = getInt(KafkaConfig.ReplicaFetchBackoffMsProp)
  def numReplicaFetchers = getInt(KafkaConfig.NumReplicaFetchersProp)
  val replicaHighWatermarkCheckpointIntervalMs = getLong(KafkaConfig.ReplicaHighWatermarkCheckpointIntervalMsProp)
  val fetchPurgatoryPurgeIntervalRequests = getInt(KafkaConfig.FetchPurgatoryPurgeIntervalRequestsProp)
  val producerPurgatoryPurgeIntervalRequests = getInt(KafkaConfig.ProducerPurgatoryPurgeIntervalRequestsProp)
  val deleteRecordsPurgatoryPurgeIntervalRequests = getInt(KafkaConfig.DeleteRecordsPurgatoryPurgeIntervalRequestsProp)
  val autoLeaderRebalanceEnable = getBoolean(KafkaConfig.AutoLeaderRebalanceEnableProp)
  val leaderImbalancePerBrokerPercentage = getInt(KafkaConfig.LeaderImbalancePerBrokerPercentageProp)
  val leaderImbalanceCheckIntervalSeconds = getLong(KafkaConfig.LeaderImbalanceCheckIntervalSecondsProp)
  def uncleanLeaderElectionEnable: java.lang.Boolean = getBoolean(KafkaConfig.UncleanLeaderElectionEnableProp)

  // We keep the user-provided String as `ApiVersion.apply` can choose a slightly different version (eg if `0.10.0`
  // is passed, `0.10.0-IV0` may be picked)
  val interBrokerProtocolVersionString = getString(KafkaConfig.InterBrokerProtocolVersionProp)
  val interBrokerProtocolVersion = ApiVersion(interBrokerProtocolVersionString)

  /** ********* Controlled shutdown configuration ***********/
  val controlledShutdownMaxRetries = getInt(KafkaConfig.ControlledShutdownMaxRetriesProp)
  val controlledShutdownRetryBackoffMs = getLong(KafkaConfig.ControlledShutdownRetryBackoffMsProp)
  val controlledShutdownEnable = getBoolean(KafkaConfig.ControlledShutdownEnableProp)

  /** ********* Feature configuration ***********/
  def isFeatureVersioningSupported = interBrokerProtocolVersion >= KAFKA_2_7_IV0

  /** ********* Group coordinator configuration ***********/
  val groupMinSessionTimeoutMs = getInt(KafkaConfig.GroupMinSessionTimeoutMsProp)
  val groupMaxSessionTimeoutMs = getInt(KafkaConfig.GroupMaxSessionTimeoutMsProp)
  val groupInitialRebalanceDelay = getInt(KafkaConfig.GroupInitialRebalanceDelayMsProp)
  val groupMaxSize = getInt(KafkaConfig.GroupMaxSizeProp)

  /** ********* Offset management configuration ***********/
  val offsetMetadataMaxSize = getInt(KafkaConfig.OffsetMetadataMaxSizeProp)
  val offsetsLoadBufferSize = getInt(KafkaConfig.OffsetsLoadBufferSizeProp)
  val offsetsTopicReplicationFactor = getShort(KafkaConfig.OffsetsTopicReplicationFactorProp)
  val offsetsTopicPartitions = getInt(KafkaConfig.OffsetsTopicPartitionsProp)
  val offsetCommitTimeoutMs = getInt(KafkaConfig.OffsetCommitTimeoutMsProp)
  val offsetCommitRequiredAcks = getShort(KafkaConfig.OffsetCommitRequiredAcksProp)
  val offsetsTopicSegmentBytes = getInt(KafkaConfig.OffsetsTopicSegmentBytesProp)
  val offsetsTopicCompressionCodec = Option(getInt(KafkaConfig.OffsetsTopicCompressionCodecProp)).map(value => CompressionCodec.getCompressionCodec(value)).orNull

  /** ********* Transaction management configuration ***********/
  val transactionalIdExpirationMs = getInt(KafkaConfig.TransactionalIdExpirationMsProp)
  val transactionMaxTimeoutMs = getInt(KafkaConfig.TransactionsMaxTimeoutMsProp)
  val transactionTopicMinISR = getInt(KafkaConfig.TransactionsTopicMinISRProp)
  val transactionsLoadBufferSize = getInt(KafkaConfig.TransactionsLoadBufferSizeProp)
  val transactionTopicReplicationFactor = getShort(KafkaConfig.TransactionsTopicReplicationFactorProp)
  val transactionTopicPartitions = getInt(KafkaConfig.TransactionsTopicPartitionsProp)
  val transactionTopicSegmentBytes = getInt(KafkaConfig.TransactionsTopicSegmentBytesProp)
  val transactionAbortTimedOutTransactionCleanupIntervalMs = getInt(KafkaConfig.TransactionsAbortTimedOutTransactionCleanupIntervalMsProp)
  val transactionRemoveExpiredTransactionalIdCleanupIntervalMs = getInt(KafkaConfig.TransactionsRemoveExpiredTransactionalIdCleanupIntervalMsProp)


  /** ********* Metric Configuration **************/
  val metricNumSamples = getInt(KafkaConfig.MetricNumSamplesProp)
  val metricSampleWindowMs = getLong(KafkaConfig.MetricSampleWindowMsProp)
  val metricRecordingLevel = getString(KafkaConfig.MetricRecordingLevelProp)

  /** ********* SSL/SASL Configuration **************/
  // Security configs may be overridden for listeners, so it is not safe to use the base values
  // Hence the base SSL/SASL configs are not fields of KafkaConfig, listener configs should be
  // retrieved using KafkaConfig#valuesWithPrefixOverride
  private def saslEnabledMechanisms(listenerName: ListenerName): Set[String] = {
    val value = valuesWithPrefixOverride(listenerName.configPrefix).get(KafkaConfig.SaslEnabledMechanismsProp)
    if (value != null)
      value.asInstanceOf[util.List[String]].asScala.toSet
    else
      Set.empty[String]
  }

  def interBrokerListenerName = getInterBrokerListenerNameAndSecurityProtocol._1
  def interBrokerSecurityProtocol = getInterBrokerListenerNameAndSecurityProtocol._2
  def controlPlaneListenerName = getControlPlaneListenerNameAndSecurityProtocol.map { case (listenerName, _) => listenerName }
  def controlPlaneSecurityProtocol = getControlPlaneListenerNameAndSecurityProtocol.map { case (_, securityProtocol) => securityProtocol }
  def saslMechanismInterBrokerProtocol = getString(KafkaConfig.SaslMechanismInterBrokerProtocolProp)
  val saslInterBrokerHandshakeRequestEnable = interBrokerProtocolVersion >= KAFKA_0_10_0_IV1

  /** ********* DelegationToken Configuration **************/
  val delegationTokenSecretKey = getPassword(KafkaConfig.DelegationTokenSecretKeyProp)
  val tokenAuthEnabled = (delegationTokenSecretKey != null && !delegationTokenSecretKey.value.isEmpty)
  val delegationTokenMaxLifeMs = getLong(KafkaConfig.DelegationTokenMaxLifeTimeProp)
  val delegationTokenExpiryTimeMs = getLong(KafkaConfig.DelegationTokenExpiryTimeMsProp)
  val delegationTokenExpiryCheckIntervalMs = getLong(KafkaConfig.DelegationTokenExpiryCheckIntervalMsProp)

  /** ********* Password encryption configuration for dynamic configs *********/
  def passwordEncoderSecret = Option(getPassword(KafkaConfig.PasswordEncoderSecretProp))
  def passwordEncoderOldSecret = Option(getPassword(KafkaConfig.PasswordEncoderOldSecretProp))
  def passwordEncoderCipherAlgorithm = getString(KafkaConfig.PasswordEncoderCipherAlgorithmProp)
  def passwordEncoderKeyFactoryAlgorithm = Option(getString(KafkaConfig.PasswordEncoderKeyFactoryAlgorithmProp))
  def passwordEncoderKeyLength = getInt(KafkaConfig.PasswordEncoderKeyLengthProp)
  def passwordEncoderIterations = getInt(KafkaConfig.PasswordEncoderIterationsProp)

  /** ********* Quota Configuration **************/
  val producerQuotaBytesPerSecondDefault = getLong(KafkaConfig.ProducerQuotaBytesPerSecondDefaultProp)
  val consumerQuotaBytesPerSecondDefault = getLong(KafkaConfig.ConsumerQuotaBytesPerSecondDefaultProp)
  val numQuotaSamples = getInt(KafkaConfig.NumQuotaSamplesProp)
  val quotaWindowSizeSeconds = getInt(KafkaConfig.QuotaWindowSizeSecondsProp)
  val numReplicationQuotaSamples = getInt(KafkaConfig.NumReplicationQuotaSamplesProp)
  val replicationQuotaWindowSizeSeconds = getInt(KafkaConfig.ReplicationQuotaWindowSizeSecondsProp)
  val numAlterLogDirsReplicationQuotaSamples = getInt(KafkaConfig.NumAlterLogDirsReplicationQuotaSamplesProp)
  val alterLogDirsReplicationQuotaWindowSizeSeconds = getInt(KafkaConfig.AlterLogDirsReplicationQuotaWindowSizeSecondsProp)
  val numControllerQuotaSamples = getInt(KafkaConfig.NumControllerQuotaSamplesProp)
  val controllerQuotaWindowSizeSeconds = getInt(KafkaConfig.ControllerQuotaWindowSizeSecondsProp)

  /** ********* Fetch Configuration **************/
  val maxIncrementalFetchSessionCacheSlots = getInt(KafkaConfig.MaxIncrementalFetchSessionCacheSlots)
  val fetchMaxBytes = getInt(KafkaConfig.FetchMaxBytes)

  val deleteTopicEnable = getBoolean(KafkaConfig.DeleteTopicEnableProp)
  def compressionType = getString(KafkaConfig.CompressionTypeProp)

  /** ********* Raft Quorum Configuration *********/
  val quorumVoters = getList(RaftConfig.QUORUM_VOTERS_CONFIG)
  val quorumElectionTimeoutMs = getInt(RaftConfig.QUORUM_ELECTION_TIMEOUT_MS_CONFIG)
  val quorumFetchTimeoutMs = getInt(RaftConfig.QUORUM_FETCH_TIMEOUT_MS_CONFIG)
  val quorumElectionBackoffMs = getInt(RaftConfig.QUORUM_ELECTION_BACKOFF_MAX_MS_CONFIG)
  val quorumLingerMs = getInt(RaftConfig.QUORUM_LINGER_MS_CONFIG)
  val quorumRequestTimeoutMs = getInt(RaftConfig.QUORUM_REQUEST_TIMEOUT_MS_CONFIG)
  val quorumRetryBackoffMs = getInt(RaftConfig.QUORUM_RETRY_BACKOFF_MS_CONFIG)

  def addReconfigurable(reconfigurable: Reconfigurable): Unit = {
    dynamicConfig.addReconfigurable(reconfigurable)
  }

  def removeReconfigurable(reconfigurable: Reconfigurable): Unit = {
    dynamicConfig.removeReconfigurable(reconfigurable)
  }

  def logRetentionTimeMillis: Long = {
    val millisInMinute = 60L * 1000L
    val millisInHour = 60L * millisInMinute

    val millis: java.lang.Long =
      Option(getLong(KafkaConfig.LogRetentionTimeMillisProp)).getOrElse(
        Option(getInt(KafkaConfig.LogRetentionTimeMinutesProp)) match {
          case Some(mins) => millisInMinute * mins
          case None => getInt(KafkaConfig.LogRetentionTimeHoursProp) * millisInHour
        })

    if (millis < 0) return -1
    millis
  }

  private def getMap(propName: String, propValue: String): Map[String, String] = {
    try {
      CoreUtils.parseCsvMap(propValue)
    } catch {
      case e: Exception => throw new IllegalArgumentException("Error parsing configuration property '%s': %s".format(propName, e.getMessage))
    }
  }

  // If the user did not define listeners but did define host or port, let's use them in backward compatible way
  // If none of those are defined, we default to PLAINTEXT://:9092
  def listeners: Seq[EndPoint] = {
    Option(getString(KafkaConfig.ListenersProp)).map { listenerProp =>
      CoreUtils.listenerListToEndPoints(listenerProp, listenerSecurityProtocolMap)
    }.getOrElse(CoreUtils.listenerListToEndPoints("PLAINTEXT://" + hostName + ":" + port, listenerSecurityProtocolMap))
  }

  def controllerListenerNames: Seq[String] =
    Option(getString(KafkaConfig.ControllerListenerNamesProp)).getOrElse("").split(",")

  def controllerListeners: Seq[EndPoint] =
    listeners.filter(l => controllerListenerNames.contains(l.listenerName.value()))

  def saslMechanismControllerProtocol = getString(KafkaConfig.SaslMechanismControllerProtocolProp)

  def controlPlaneListener: Option[EndPoint] = {
    controlPlaneListenerName.map { listenerName =>
      listeners.filter(endpoint => endpoint.listenerName.value() == listenerName.value()).head
    }
  }

  def dataPlaneListeners: Seq[EndPoint] = {
    listeners.filterNot { listener =>
      val name = listener.listenerName.value()
      name.equals(getString(KafkaConfig.ControlPlaneListenerNameProp)) ||
        controllerListenerNames.contains(name)
    }
  }

  // If the user defined advertised listeners, we use those
  // If they didn't but did define advertised host or port, we'll use those and fill in the missing value from regular host / port or defaults
  // If none of these are defined, we'll use the listeners
  def advertisedListeners: Seq[EndPoint] = {
    val advertisedListenersProp = getString(KafkaConfig.AdvertisedListenersProp)
    if (advertisedListenersProp != null)
      CoreUtils.listenerListToEndPoints(advertisedListenersProp, listenerSecurityProtocolMap, requireDistinctPorts=false)
    else if (getString(KafkaConfig.AdvertisedHostNameProp) != null || getInt(KafkaConfig.AdvertisedPortProp) != null)
      CoreUtils.listenerListToEndPoints("PLAINTEXT://" + advertisedHostName + ":" + advertisedPort, listenerSecurityProtocolMap, requireDistinctPorts=false)
    else
      listeners.filterNot(l => controllerListenerNames.contains(l.listenerName.value()))
  }

  private def getInterBrokerListenerNameAndSecurityProtocol: (ListenerName, SecurityProtocol) = {
    Option(getString(KafkaConfig.InterBrokerListenerNameProp)) match {
      case Some(_) if originals.containsKey(KafkaConfig.InterBrokerSecurityProtocolProp) =>
        throw new ConfigException(s"Only one of ${KafkaConfig.InterBrokerListenerNameProp} and " +
          s"${KafkaConfig.InterBrokerSecurityProtocolProp} should be set.")
      case Some(name) =>
        val listenerName = ListenerName.normalised(name)
        val securityProtocol = listenerSecurityProtocolMap.getOrElse(listenerName,
          throw new ConfigException(s"Listener with name ${listenerName.value} defined in " +
            s"${KafkaConfig.InterBrokerListenerNameProp} not found in ${KafkaConfig.ListenerSecurityProtocolMapProp}."))
        (listenerName, securityProtocol)
      case None =>
        val securityProtocol = getSecurityProtocol(getString(KafkaConfig.InterBrokerSecurityProtocolProp),
          KafkaConfig.InterBrokerSecurityProtocolProp)
        (ListenerName.forSecurityProtocol(securityProtocol), securityProtocol)
    }
  }

  private def getControlPlaneListenerNameAndSecurityProtocol: Option[(ListenerName, SecurityProtocol)] = {
    Option(getString(KafkaConfig.ControlPlaneListenerNameProp)) match {
      case Some(name) =>
        val listenerName = ListenerName.normalised(name)
        val securityProtocol = listenerSecurityProtocolMap.getOrElse(listenerName,
          throw new ConfigException(s"Listener with ${listenerName.value} defined in " +
            s"${KafkaConfig.ControlPlaneListenerNameProp} not found in ${KafkaConfig.ListenerSecurityProtocolMapProp}."))
        Some(listenerName, securityProtocol)

      case None => None
   }
  }

  private def getSecurityProtocol(protocolName: String, configName: String): SecurityProtocol = {
    try SecurityProtocol.forName(protocolName)
    catch {
      case _: IllegalArgumentException =>
        throw new ConfigException(s"Invalid security protocol `$protocolName` defined in $configName")
    }
  }

  def listenerSecurityProtocolMap: Map[ListenerName, SecurityProtocol] = {
    getMap(KafkaConfig.ListenerSecurityProtocolMapProp, getString(KafkaConfig.ListenerSecurityProtocolMapProp))
      .map { case (listenerName, protocolName) =>
      ListenerName.normalised(listenerName) -> getSecurityProtocol(protocolName, KafkaConfig.ListenerSecurityProtocolMapProp)
    }
  }

  def usesTopicId: Boolean =
    interBrokerProtocolVersion >= KAFKA_2_8_IV0

  validateValues()

  private def validateValues(): Unit = {
    if (requiresZookeeper) {
      if (zkConnect == null) {
        throw new ConfigException(s"Missing required configuration `${KafkaConfig.ZkConnectProp}` which has no default value.")
      }
      if (brokerIdGenerationEnable) {
        require(brokerId >= -1 && brokerId <= maxReservedBrokerId, "broker.id must be greater than or equal to -1 and not greater than reserved.broker.max.id")
      } else {
        require(brokerId >= 0, "broker.id must be greater than or equal to 0")
      }
    } else {
      // KRaft-based metadata quorum
      if (nodeId < 0) {
        throw new ConfigException(s"Missing configuration `${KafkaConfig.NodeIdProp}` which is required " +
          s"when `process.roles` is defined (i.e. when running in KRaft mode).")
      }
    }
    require(logRollTimeMillis >= 1, "log.roll.ms must be greater than or equal to 1")
    require(logRollTimeJitterMillis >= 0, "log.roll.jitter.ms must be greater than or equal to 0")
    require(logRetentionTimeMillis >= 1 || logRetentionTimeMillis == -1, "log.retention.ms must be unlimited (-1) or, greater than or equal to 1")
    require(logDirs.nonEmpty, "At least one log directory must be defined via log.dirs or log.dir.")
    require(logCleanerDedupeBufferSize / logCleanerThreads > 1024 * 1024, "log.cleaner.dedupe.buffer.size must be at least 1MB per cleaner thread.")
    require(replicaFetchWaitMaxMs <= replicaSocketTimeoutMs, "replica.socket.timeout.ms should always be at least replica.fetch.wait.max.ms" +
      " to prevent unnecessary socket timeouts")
    require(replicaFetchWaitMaxMs <= replicaLagTimeMaxMs, "replica.fetch.wait.max.ms should always be less than or equal to replica.lag.time.max.ms" +
      " to prevent frequent changes in ISR")
    require(offsetCommitRequiredAcks >= -1 && offsetCommitRequiredAcks <= offsetsTopicReplicationFactor,
      "offsets.commit.required.acks must be greater or equal -1 and less or equal to offsets.topic.replication.factor")
    require(BrokerCompressionCodec.isValid(compressionType), "compression.type : " + compressionType + " is not valid." +
      " Valid options are " + BrokerCompressionCodec.brokerCompressionOptions.mkString(","))

    val advertisedListenerNames = advertisedListeners.map(_.listenerName).toSet
    val listenerNames = listeners.map(_.listenerName).toSet
    if (processRoles.isEmpty || processRoles.contains(BrokerRole)) {
      require(advertisedListenerNames.contains(interBrokerListenerName),
        s"${KafkaConfig.InterBrokerListenerNameProp} must be a listener name defined in ${KafkaConfig.AdvertisedListenersProp}. " +
          s"The valid options based on currently configured listeners are ${advertisedListenerNames.map(_.value).mkString(",")}")
      require(advertisedListenerNames.subsetOf(listenerNames),
        s"${KafkaConfig.AdvertisedListenersProp} listener names must be equal to or a subset of the ones defined in ${KafkaConfig.ListenersProp}. " +
          s"Found ${advertisedListenerNames.map(_.value).mkString(",")}. The valid options based on the current configuration " +
          s"are ${listenerNames.map(_.value).mkString(",")}"
      )
    }

    require(!advertisedListeners.exists(endpoint => endpoint.host=="0.0.0.0"),
      s"${KafkaConfig.AdvertisedListenersProp} cannot use the nonroutable meta-address 0.0.0.0. "+
      s"Use a routable IP address.")

    // Ensure controller listeners are not in the advertised listeners list
    require(!controllerListeners.exists(advertisedListeners.contains),
      s"${KafkaConfig.AdvertisedListenersProp} cannot contain any of ${KafkaConfig.ControllerListenerNamesProp}")

    // validate controller.listener.name config
    if (controlPlaneListenerName.isDefined) {
      require(advertisedListenerNames.contains(controlPlaneListenerName.get),
        s"${KafkaConfig.ControlPlaneListenerNameProp} must be a listener name defined in ${KafkaConfig.AdvertisedListenersProp}. " +
        s"The valid options based on currently configured listeners are ${advertisedListenerNames.map(_.value).mkString(",")}")
      // controlPlaneListenerName should be different from interBrokerListenerName
      require(!controlPlaneListenerName.get.value().equals(interBrokerListenerName.value()),
        s"${KafkaConfig.ControlPlaneListenerNameProp}, when defined, should have a different value from the inter broker listener name. " +
        s"Currently they both have the value ${controlPlaneListenerName.get}")
    }

    val recordVersion = logMessageFormatVersion.recordVersion
    require(interBrokerProtocolVersion.recordVersion.value >= recordVersion.value,
      s"log.message.format.version $logMessageFormatVersionString can only be used when inter.broker.protocol.version " +
      s"is set to version ${ApiVersion.minSupportedFor(recordVersion).shortVersion} or higher")

    if (offsetsTopicCompressionCodec == ZStdCompressionCodec)
      require(interBrokerProtocolVersion.recordVersion.value >= KAFKA_2_1_IV0.recordVersion.value,
        "offsets.topic.compression.codec zstd can only be used when inter.broker.protocol.version " +
        s"is set to version ${KAFKA_2_1_IV0.shortVersion} or higher")

    val interBrokerUsesSasl = interBrokerSecurityProtocol == SecurityProtocol.SASL_PLAINTEXT || interBrokerSecurityProtocol == SecurityProtocol.SASL_SSL
    require(!interBrokerUsesSasl || saslInterBrokerHandshakeRequestEnable || saslMechanismInterBrokerProtocol == SaslConfigs.GSSAPI_MECHANISM,
      s"Only GSSAPI mechanism is supported for inter-broker communication with SASL when inter.broker.protocol.version is set to $interBrokerProtocolVersionString")
    require(!interBrokerUsesSasl || saslEnabledMechanisms(interBrokerListenerName).contains(saslMechanismInterBrokerProtocol),
      s"${KafkaConfig.SaslMechanismInterBrokerProtocolProp} must be included in ${KafkaConfig.SaslEnabledMechanismsProp} when SASL is used for inter-broker communication")
    require(queuedMaxBytes <= 0 || queuedMaxBytes >= socketRequestMaxBytes,
      s"${KafkaConfig.QueuedMaxBytesProp} must be larger or equal to ${KafkaConfig.SocketRequestMaxBytesProp}")

    if (maxConnectionsPerIp == 0)
      require(!maxConnectionsPerIpOverrides.isEmpty, s"${KafkaConfig.MaxConnectionsPerIpProp} can be set to zero only if" +
        s" ${KafkaConfig.MaxConnectionsPerIpOverridesProp} property is set.")

    val invalidAddresses = maxConnectionsPerIpOverrides.keys.filterNot(address => Utils.validHostPattern(address))
    if (!invalidAddresses.isEmpty)
      throw new IllegalArgumentException(s"${KafkaConfig.MaxConnectionsPerIpOverridesProp} contains invalid addresses : ${invalidAddresses.mkString(",")}")

    if (connectionsMaxIdleMs >= 0)
      require(failedAuthenticationDelayMs < connectionsMaxIdleMs,
        s"${KafkaConfig.FailedAuthenticationDelayMsProp}=$failedAuthenticationDelayMs should always be less than" +
        s" ${KafkaConfig.ConnectionsMaxIdleMsProp}=$connectionsMaxIdleMs to prevent failed" +
        s" authentication responses from timing out")
  }
}