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RecordHelpers.java
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RecordHelpers.java
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/*
* 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 org.apache.kafka.coordinator.group;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.record.RecordBatch;
import org.apache.kafka.common.requests.OffsetCommitRequest;
import org.apache.kafka.coordinator.group.consumer.ConsumerGroupMember;
import org.apache.kafka.coordinator.group.consumer.TopicMetadata;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupCurrentMemberAssignmentKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupCurrentMemberAssignmentValue;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupMemberMetadataKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupMemberMetadataValue;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupMetadataKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupMetadataValue;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupPartitionMetadataKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupPartitionMetadataValue;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMemberKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMemberValue;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMetadataKey;
import org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMetadataValue;
import org.apache.kafka.coordinator.group.generated.GroupMetadataKey;
import org.apache.kafka.coordinator.group.generated.GroupMetadataValue;
import org.apache.kafka.coordinator.group.generated.OffsetCommitKey;
import org.apache.kafka.coordinator.group.generated.OffsetCommitValue;
import org.apache.kafka.coordinator.group.classic.ClassicGroup;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import org.apache.kafka.server.common.MetadataVersion;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* This class contains helper methods to create records stored in
* the __consumer_offsets topic.
*/
public class RecordHelpers {
private RecordHelpers() {}
/**
* Creates a ConsumerGroupMemberMetadata record.
*
* @param groupId The consumer group id.
* @param member The consumer group member.
* @return The record.
*/
public static Record newMemberSubscriptionRecord(
String groupId,
ConsumerGroupMember member
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupMemberMetadataKey()
.setGroupId(groupId)
.setMemberId(member.memberId()),
(short) 5
),
new ApiMessageAndVersion(
new ConsumerGroupMemberMetadataValue()
.setRackId(member.rackId())
.setInstanceId(member.instanceId())
.setClientId(member.clientId())
.setClientHost(member.clientHost())
.setSubscribedTopicNames(member.subscribedTopicNames())
.setSubscribedTopicRegex(member.subscribedTopicRegex())
.setServerAssignor(member.serverAssignorName().orElse(null))
.setRebalanceTimeoutMs(member.rebalanceTimeoutMs())
.setClassicMemberMetadata(member.classicMemberMetadata().orElse(null)),
(short) 0
)
);
}
/**
* Creates a ConsumerGroupMemberMetadata tombstone.
*
* @param groupId The consumer group id.
* @param memberId The consumer group member id.
* @return The record.
*/
public static Record newMemberSubscriptionTombstoneRecord(
String groupId,
String memberId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupMemberMetadataKey()
.setGroupId(groupId)
.setMemberId(memberId),
(short) 5
),
null // Tombstone.
);
}
/**
* Creates a ConsumerGroupPartitionMetadata record.
*
* @param groupId The consumer group id.
* @param newSubscriptionMetadata The subscription metadata.
* @return The record.
*/
public static Record newGroupSubscriptionMetadataRecord(
String groupId,
Map<String, TopicMetadata> newSubscriptionMetadata
) {
ConsumerGroupPartitionMetadataValue value = new ConsumerGroupPartitionMetadataValue();
newSubscriptionMetadata.forEach((topicName, topicMetadata) -> {
List<ConsumerGroupPartitionMetadataValue.PartitionMetadata> partitionMetadata = new ArrayList<>();
// If the partition rack information map is empty, store an empty list in the record.
if (!topicMetadata.partitionRacks().isEmpty()) {
topicMetadata.partitionRacks().forEach((partition, racks) ->
partitionMetadata.add(new ConsumerGroupPartitionMetadataValue.PartitionMetadata()
.setPartition(partition)
.setRacks(new ArrayList<>(racks))
)
);
}
value.topics().add(new ConsumerGroupPartitionMetadataValue.TopicMetadata()
.setTopicId(topicMetadata.id())
.setTopicName(topicMetadata.name())
.setNumPartitions(topicMetadata.numPartitions())
.setPartitionMetadata(partitionMetadata)
);
});
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupPartitionMetadataKey()
.setGroupId(groupId),
(short) 4
),
new ApiMessageAndVersion(
value,
(short) 0
)
);
}
/**
* Creates a ConsumerGroupPartitionMetadata tombstone.
*
* @param groupId The consumer group id.
* @return The record.
*/
public static Record newGroupSubscriptionMetadataTombstoneRecord(
String groupId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupPartitionMetadataKey()
.setGroupId(groupId),
(short) 4
),
null // Tombstone.
);
}
/**
* Creates a ConsumerGroupMetadata record.
*
* @param groupId The consumer group id.
* @param newGroupEpoch The consumer group epoch.
* @return The record.
*/
public static Record newGroupEpochRecord(
String groupId,
int newGroupEpoch
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupMetadataKey()
.setGroupId(groupId),
(short) 3
),
new ApiMessageAndVersion(
new ConsumerGroupMetadataValue()
.setEpoch(newGroupEpoch),
(short) 0
)
);
}
/**
* Creates a ConsumerGroupMetadata tombstone.
*
* @param groupId The consumer group id.
* @return The record.
*/
public static Record newGroupEpochTombstoneRecord(
String groupId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupMetadataKey()
.setGroupId(groupId),
(short) 3
),
null // Tombstone.
);
}
/**
* Creates a ConsumerGroupTargetAssignmentMember record.
*
* @param groupId The consumer group id.
* @param memberId The consumer group member id.
* @param partitions The target partitions of the member.
* @return The record.
*/
public static Record newTargetAssignmentRecord(
String groupId,
String memberId,
Map<Uuid, Set<Integer>> partitions
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMemberKey()
.setGroupId(groupId)
.setMemberId(memberId),
(short) 7
),
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMemberValue()
.setTopicPartitions(partitions.entrySet().stream()
.map(keyValue -> new ConsumerGroupTargetAssignmentMemberValue.TopicPartition()
.setTopicId(keyValue.getKey())
.setPartitions(new ArrayList<>(keyValue.getValue())))
.collect(Collectors.toList())),
(short) 0
)
);
}
/**
* Creates a ConsumerGroupTargetAssignmentMember tombstone.
*
* @param groupId The consumer group id.
* @param memberId The consumer group member id.
* @return The record.
*/
public static Record newTargetAssignmentTombstoneRecord(
String groupId,
String memberId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMemberKey()
.setGroupId(groupId)
.setMemberId(memberId),
(short) 7
),
null // Tombstone.
);
}
/**
* Creates a ConsumerGroupTargetAssignmentMetadata record.
*
* @param groupId The consumer group id.
* @param assignmentEpoch The consumer group epoch.
* @return The record.
*/
public static Record newTargetAssignmentEpochRecord(
String groupId,
int assignmentEpoch
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMetadataKey()
.setGroupId(groupId),
(short) 6
),
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMetadataValue()
.setAssignmentEpoch(assignmentEpoch),
(short) 0
)
);
}
/**
* Creates a ConsumerGroupTargetAssignmentMetadata tombstone.
*
* @param groupId The consumer group id.
* @return The record.
*/
public static Record newTargetAssignmentEpochTombstoneRecord(
String groupId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupTargetAssignmentMetadataKey()
.setGroupId(groupId),
(short) 6
),
null // Tombstone.
);
}
/**
* Creates a ConsumerGroupCurrentMemberAssignment record.
*
* @param groupId The consumer group id.
* @param member The consumer group member.
* @return The record.
*/
public static Record newCurrentAssignmentRecord(
String groupId,
ConsumerGroupMember member
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupCurrentMemberAssignmentKey()
.setGroupId(groupId)
.setMemberId(member.memberId()),
(short) 8
),
new ApiMessageAndVersion(
new ConsumerGroupCurrentMemberAssignmentValue()
.setMemberEpoch(member.memberEpoch())
.setPreviousMemberEpoch(member.previousMemberEpoch())
.setState(member.state().value())
.setAssignedPartitions(toTopicPartitions(member.assignedPartitions()))
.setPartitionsPendingRevocation(toTopicPartitions(member.partitionsPendingRevocation())),
(short) 0
)
);
}
/**
* Creates a ConsumerGroupCurrentMemberAssignment tombstone.
*
* @param groupId The consumer group id.
* @param memberId The consumer group member id.
* @return The record.
*/
public static Record newCurrentAssignmentTombstoneRecord(
String groupId,
String memberId
) {
return new Record(
new ApiMessageAndVersion(
new ConsumerGroupCurrentMemberAssignmentKey()
.setGroupId(groupId)
.setMemberId(memberId),
(short) 8
),
null // Tombstone
);
}
/**
* Creates a GroupMetadata record.
*
* @param group The classic group.
* @param assignment The classic group assignment.
* @param metadataVersion The metadata version.
* @return The record.
*/
public static Record newGroupMetadataRecord(
ClassicGroup group,
Map<String, byte[]> assignment,
MetadataVersion metadataVersion
) {
List<GroupMetadataValue.MemberMetadata> members = new ArrayList<>(group.allMembers().size());
group.allMembers().forEach(member -> {
byte[] subscription = group.protocolName().map(member::metadata).orElse(null);
if (subscription == null) {
throw new IllegalStateException("Attempted to write non-empty group metadata with no defined protocol.");
}
byte[] memberAssignment = assignment.get(member.memberId());
if (memberAssignment == null) {
throw new IllegalStateException("Attempted to write member " + member.memberId() +
" of group " + group.groupId() + " with no assignment.");
}
members.add(
new GroupMetadataValue.MemberMetadata()
.setMemberId(member.memberId())
.setClientId(member.clientId())
.setClientHost(member.clientHost())
.setRebalanceTimeout(member.rebalanceTimeoutMs())
.setSessionTimeout(member.sessionTimeoutMs())
.setGroupInstanceId(member.groupInstanceId().orElse(null))
.setSubscription(subscription)
.setAssignment(memberAssignment)
);
});
return new Record(
new ApiMessageAndVersion(
new GroupMetadataKey()
.setGroup(group.groupId()),
(short) 2
),
new ApiMessageAndVersion(
new GroupMetadataValue()
.setProtocol(group.protocolName().orElse(null))
.setProtocolType(group.protocolType().orElse(""))
.setGeneration(group.generationId())
.setLeader(group.leaderOrNull())
.setCurrentStateTimestamp(group.currentStateTimestampOrDefault())
.setMembers(members),
metadataVersion.groupMetadataValueVersion()
)
);
}
/**
* Creates a GroupMetadata tombstone.
*
* @param groupId The group id.
* @return The record.
*/
public static Record newGroupMetadataTombstoneRecord(
String groupId
) {
return new Record(
new ApiMessageAndVersion(
new GroupMetadataKey()
.setGroup(groupId),
(short) 2
),
null // Tombstone
);
}
/**
* Creates an empty GroupMetadata record.
*
* @param group The classic group.
* @param metadataVersion The metadata version.
* @return The record.
*/
public static Record newEmptyGroupMetadataRecord(
ClassicGroup group,
MetadataVersion metadataVersion
) {
return new Record(
new ApiMessageAndVersion(
new GroupMetadataKey()
.setGroup(group.groupId()),
(short) 2
),
new ApiMessageAndVersion(
new GroupMetadataValue()
.setProtocol(null)
.setProtocolType("")
.setGeneration(0)
.setLeader(null)
.setCurrentStateTimestamp(group.currentStateTimestampOrDefault())
.setMembers(Collections.emptyList()),
metadataVersion.groupMetadataValueVersion()
)
);
}
/**
* Creates an OffsetCommit record.
*
* @param groupId The group id.
* @param topic The topic name.
* @param partitionId The partition id.
* @param offsetAndMetadata The offset and metadata.
* @param metadataVersion The metadata version.
* @return The record.
*/
public static Record newOffsetCommitRecord(
String groupId,
String topic,
int partitionId,
OffsetAndMetadata offsetAndMetadata,
MetadataVersion metadataVersion
) {
short version = metadataVersion.offsetCommitValueVersion(offsetAndMetadata.expireTimestampMs.isPresent());
return new Record(
new ApiMessageAndVersion(
new OffsetCommitKey()
.setGroup(groupId)
.setTopic(topic)
.setPartition(partitionId),
(short) 1
),
new ApiMessageAndVersion(
new OffsetCommitValue()
.setOffset(offsetAndMetadata.committedOffset)
.setLeaderEpoch(offsetAndMetadata.leaderEpoch.orElse(RecordBatch.NO_PARTITION_LEADER_EPOCH))
.setMetadata(offsetAndMetadata.metadata)
.setCommitTimestamp(offsetAndMetadata.commitTimestampMs)
// Version 1 has a non-empty expireTimestamp field
.setExpireTimestamp(offsetAndMetadata.expireTimestampMs.orElse(OffsetCommitRequest.DEFAULT_TIMESTAMP)),
version
)
);
}
/**
* Creates an OffsetCommit tombstone record.
*
* @param groupId The group id.
* @param topic The topic name.
* @param partitionId The partition id.
* @return The record.
*/
public static Record newOffsetCommitTombstoneRecord(
String groupId,
String topic,
int partitionId
) {
return new Record(
new ApiMessageAndVersion(
new OffsetCommitKey()
.setGroup(groupId)
.setTopic(topic)
.setPartition(partitionId),
(short) 1
),
null
);
}
private static List<ConsumerGroupCurrentMemberAssignmentValue.TopicPartitions> toTopicPartitions(
Map<Uuid, Set<Integer>> topicPartitions
) {
List<ConsumerGroupCurrentMemberAssignmentValue.TopicPartitions> topics = new ArrayList<>(topicPartitions.size());
topicPartitions.forEach((topicId, partitions) ->
topics.add(new ConsumerGroupCurrentMemberAssignmentValue.TopicPartitions()
.setTopicId(topicId)
.setPartitions(new ArrayList<>(partitions)))
);
return topics;
}
}