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[SPARK-6211][Streaming] Add Python Kafka API unit test
Refactor the Kafka unit test and add Python API support. CC tdas davies please help to review, thanks a lot. Author: jerryshao <saisai.shao@intel.com> Author: Saisai Shao <saisai.shao@intel.com> Closes #4961 from jerryshao/SPARK-6211 and squashes the following commits: ee4b919 [jerryshao] Fixed newly merged issue 82c756e [jerryshao] Address the comments 92912d1 [jerryshao] Address the commits 0708bb1 [jerryshao] Fix rebase issue 40b47a3 [Saisai Shao] Style fix f889657 [Saisai Shao] Update the code according 8a2f3e2 [jerryshao] Address the issues 0f1b7ce [jerryshao] Still fix the bug 61a04f0 [jerryshao] Fix bugs and address the issues 64d9877 [jerryshao] Fix rebase bugs 8ad442f [jerryshao] Add kafka-assembly in run-tests 6020b00 [jerryshao] Add more debug info in Shell 8102d6e [jerryshao] Fix bug in Jenkins test fde1213 [jerryshao] Code style changes 5536f95 [jerryshao] Refactor the Kafka unit test and add Python Kafka unittest support
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external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaTestUtils.scala
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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. | ||
| */ | ||
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| package org.apache.spark.streaming.kafka | ||
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| import java.io.File | ||
| import java.lang.{Integer => JInt} | ||
| import java.net.InetSocketAddress | ||
| import java.util.{Map => JMap} | ||
| import java.util.Properties | ||
| import java.util.concurrent.TimeoutException | ||
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| import scala.annotation.tailrec | ||
| import scala.language.postfixOps | ||
| import scala.util.control.NonFatal | ||
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| import kafka.admin.AdminUtils | ||
| import kafka.producer.{KeyedMessage, Producer, ProducerConfig} | ||
| import kafka.serializer.StringEncoder | ||
| import kafka.server.{KafkaConfig, KafkaServer} | ||
| import kafka.utils.ZKStringSerializer | ||
| import org.apache.zookeeper.server.{NIOServerCnxnFactory, ZooKeeperServer} | ||
| import org.I0Itec.zkclient.ZkClient | ||
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| import org.apache.spark.{Logging, SparkConf} | ||
| import org.apache.spark.streaming.Time | ||
| import org.apache.spark.util.Utils | ||
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| /** | ||
| * This is a helper class for Kafka test suites. This has the functionality to set up | ||
| * and tear down local Kafka servers, and to push data using Kafka producers. | ||
| * | ||
| * The reason to put Kafka test utility class in src is to test Python related Kafka APIs. | ||
| */ | ||
| private class KafkaTestUtils extends Logging { | ||
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| // Zookeeper related configurations | ||
| private val zkHost = "localhost" | ||
| private var zkPort: Int = 0 | ||
| private val zkConnectionTimeout = 6000 | ||
| private val zkSessionTimeout = 6000 | ||
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| private var zookeeper: EmbeddedZookeeper = _ | ||
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| private var zkClient: ZkClient = _ | ||
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| // Kafka broker related configurations | ||
| private val brokerHost = "localhost" | ||
| private var brokerPort = 9092 | ||
| private var brokerConf: KafkaConfig = _ | ||
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| // Kafka broker server | ||
| private var server: KafkaServer = _ | ||
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| // Kafka producer | ||
| private var producer: Producer[String, String] = _ | ||
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| // Flag to test whether the system is correctly started | ||
| private var zkReady = false | ||
| private var brokerReady = false | ||
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| def zkAddress: String = { | ||
| assert(zkReady, "Zookeeper not setup yet or already torn down, cannot get zookeeper address") | ||
| s"$zkHost:$zkPort" | ||
| } | ||
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| def brokerAddress: String = { | ||
| assert(brokerReady, "Kafka not setup yet or already torn down, cannot get broker address") | ||
| s"$brokerHost:$brokerPort" | ||
| } | ||
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| def zookeeperClient: ZkClient = { | ||
| assert(zkReady, "Zookeeper not setup yet or already torn down, cannot get zookeeper client") | ||
| Option(zkClient).getOrElse( | ||
| throw new IllegalStateException("Zookeeper client is not yet initialized")) | ||
| } | ||
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| // Set up the Embedded Zookeeper server and get the proper Zookeeper port | ||
| private def setupEmbeddedZookeeper(): Unit = { | ||
| // Zookeeper server startup | ||
| zookeeper = new EmbeddedZookeeper(s"$zkHost:$zkPort") | ||
| // Get the actual zookeeper binding port | ||
| zkPort = zookeeper.actualPort | ||
| zkClient = new ZkClient(s"$zkHost:$zkPort", zkSessionTimeout, zkConnectionTimeout, | ||
| ZKStringSerializer) | ||
| zkReady = true | ||
| } | ||
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| // Set up the Embedded Kafka server | ||
| private def setupEmbeddedKafkaServer(): Unit = { | ||
| assert(zkReady, "Zookeeper should be set up beforehand") | ||
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| // Kafka broker startup | ||
| Utils.startServiceOnPort(brokerPort, port => { | ||
| brokerPort = port | ||
| brokerConf = new KafkaConfig(brokerConfiguration) | ||
| server = new KafkaServer(brokerConf) | ||
| server.startup() | ||
| (server, port) | ||
| }, new SparkConf(), "KafkaBroker") | ||
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| brokerReady = true | ||
| } | ||
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| /** setup the whole embedded servers, including Zookeeper and Kafka brokers */ | ||
| def setup(): Unit = { | ||
| setupEmbeddedZookeeper() | ||
| setupEmbeddedKafkaServer() | ||
| } | ||
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| /** Teardown the whole servers, including Kafka broker and Zookeeper */ | ||
| def teardown(): Unit = { | ||
| brokerReady = false | ||
| zkReady = false | ||
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| if (producer != null) { | ||
| producer.close() | ||
| producer = null | ||
| } | ||
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| if (server != null) { | ||
| server.shutdown() | ||
| server = null | ||
| } | ||
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| brokerConf.logDirs.foreach { f => Utils.deleteRecursively(new File(f)) } | ||
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| if (zkClient != null) { | ||
| zkClient.close() | ||
| zkClient = null | ||
| } | ||
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| if (zookeeper != null) { | ||
| zookeeper.shutdown() | ||
| zookeeper = null | ||
| } | ||
| } | ||
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| /** Create a Kafka topic and wait until it propagated to the whole cluster */ | ||
| def createTopic(topic: String): Unit = { | ||
| AdminUtils.createTopic(zkClient, topic, 1, 1) | ||
| // wait until metadata is propagated | ||
| waitUntilMetadataIsPropagated(topic, 0) | ||
| } | ||
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| /** Java-friendly function for sending messages to the Kafka broker */ | ||
| def sendMessages(topic: String, messageToFreq: JMap[String, JInt]): Unit = { | ||
| import scala.collection.JavaConversions._ | ||
| sendMessages(topic, Map(messageToFreq.mapValues(_.intValue()).toSeq: _*)) | ||
| } | ||
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| /** Send the messages to the Kafka broker */ | ||
| def sendMessages(topic: String, messageToFreq: Map[String, Int]): Unit = { | ||
| val messages = messageToFreq.flatMap { case (s, freq) => Seq.fill(freq)(s) }.toArray | ||
| sendMessages(topic, messages) | ||
| } | ||
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| /** Send the array of messages to the Kafka broker */ | ||
| def sendMessages(topic: String, messages: Array[String]): Unit = { | ||
| producer = new Producer[String, String](new ProducerConfig(producerConfiguration)) | ||
| producer.send(messages.map { new KeyedMessage[String, String](topic, _ ) }: _*) | ||
| producer.close() | ||
| producer = null | ||
| } | ||
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| private def brokerConfiguration: Properties = { | ||
| val props = new Properties() | ||
| props.put("broker.id", "0") | ||
| props.put("host.name", "localhost") | ||
| props.put("port", brokerPort.toString) | ||
| props.put("log.dir", Utils.createTempDir().getAbsolutePath) | ||
| props.put("zookeeper.connect", zkAddress) | ||
| props.put("log.flush.interval.messages", "1") | ||
| props.put("replica.socket.timeout.ms", "1500") | ||
| props | ||
| } | ||
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| private def producerConfiguration: Properties = { | ||
| val props = new Properties() | ||
| props.put("metadata.broker.list", brokerAddress) | ||
| props.put("serializer.class", classOf[StringEncoder].getName) | ||
| props | ||
| } | ||
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| // A simplified version of scalatest eventually, rewritten here to avoid adding extra test | ||
| // dependency | ||
| def eventually[T](timeout: Time, interval: Time)(func: => T): T = { | ||
| def makeAttempt(): Either[Throwable, T] = { | ||
| try { | ||
| Right(func) | ||
| } catch { | ||
| case e if NonFatal(e) => Left(e) | ||
| } | ||
| } | ||
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| val startTime = System.currentTimeMillis() | ||
| @tailrec | ||
| def tryAgain(attempt: Int): T = { | ||
| makeAttempt() match { | ||
| case Right(result) => result | ||
| case Left(e) => | ||
| val duration = System.currentTimeMillis() - startTime | ||
| if (duration < timeout.milliseconds) { | ||
| Thread.sleep(interval.milliseconds) | ||
| } else { | ||
| throw new TimeoutException(e.getMessage) | ||
| } | ||
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| tryAgain(attempt + 1) | ||
| } | ||
| } | ||
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| tryAgain(1) | ||
| } | ||
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| private def waitUntilMetadataIsPropagated(topic: String, partition: Int): Unit = { | ||
| eventually(Time(10000), Time(100)) { | ||
| assert( | ||
| server.apis.metadataCache.containsTopicAndPartition(topic, partition), | ||
| s"Partition [$topic, $partition] metadata not propagated after timeout" | ||
| ) | ||
| } | ||
| } | ||
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| private class EmbeddedZookeeper(val zkConnect: String) { | ||
| val snapshotDir = Utils.createTempDir() | ||
| val logDir = Utils.createTempDir() | ||
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| val zookeeper = new ZooKeeperServer(snapshotDir, logDir, 500) | ||
| val (ip, port) = { | ||
| val splits = zkConnect.split(":") | ||
| (splits(0), splits(1).toInt) | ||
| } | ||
| val factory = new NIOServerCnxnFactory() | ||
| factory.configure(new InetSocketAddress(ip, port), 16) | ||
| factory.startup(zookeeper) | ||
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| val actualPort = factory.getLocalPort | ||
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| def shutdown() { | ||
| factory.shutdown() | ||
| Utils.deleteRecursively(snapshotDir) | ||
| Utils.deleteRecursively(logDir) | ||
| } | ||
| } | ||
| } | ||
|
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