[GitHub] spark pull request: [SPARK-6211][Streaming] Add Python Kafka API u...

[tdas <gi...@git.apache.org>]

Github user tdas commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4961#discussion_r27715991
  
    --- Diff: external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaTestUtils.scala ---
    @@ -0,0 +1,272 @@
    +/*
    + * 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.spark.streaming.kafka
    +
    +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
    +
    +import scala.annotation.tailrec
    +import scala.language.postfixOps
    +import scala.util.Random
    +import scala.util.control.NonFatal
    +
    +import kafka.admin.AdminUtils
    +import kafka.common.KafkaException
    +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
    +
    +import org.apache.spark.Logging
    +import org.apache.spark.streaming.Time
    +import org.apache.spark.util.Utils
    +
    +/**
    + * 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 {
    +
    +  // Zookeeper related configurations
    +  private val zkHost = "localhost"
    +  private var zkPort: Int = 0
    +  private val zkConnectionTimeout = 6000
    +  private val zkSessionTimeout = 6000
    +
    +  private var zookeeper: EmbeddedZookeeper = _
    +
    +  private var zkClient: ZkClient = _
    +
    +  // Kafka broker related configurations
    +  private val brokerHost = "localhost"
    +  private var brokerPort = 9092
    +  private var brokerConf: KafkaConfig = _
    +
    +  // Kafka broker server
    +  private var server: KafkaServer = _
    +
    +  // Kafka producer
    +  private var producer: Producer[String, String] = _
    +
    +  // Flag to test whether the system is correctly started
    +  private var zkReady = false
    +  private var brokerReady = false
    +
    +  def zkAddress: String = {
    +    assert(zkReady, "Zookeeper not setup yet or already torn down, cannot get zookeeper address")
    +    s"$zkHost:$zkPort"
    +  }
    +
    +  def brokerAddress: String = {
    +    assert(brokerReady, "Kafka not setup yet or already torn down, cannot get broker address")
    +    s"$brokerHost:$brokerPort"
    +  }
    +
    +  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"))
    +  }
    +
    +  // 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
    +  }
    +
    +  // Set up the Embedded Kafka server
    +  private def setupEmbeddedKafkaServer(): Unit = {
    +    assert(zkReady, "Zookeeper should be set up beforehand")
    +    // Kafka broker startup
    +    var bindSuccess: Boolean = false
    +    while(!bindSuccess) {
    +      try {
    +        brokerConf = new KafkaConfig(brokerConfigure)
    +        server = new KafkaServer(brokerConf)
    +        server.startup()
    +        bindSuccess = true
    +      } catch {
    +        case e: KafkaException =>
    +          if (e.getMessage != null && e.getMessage.contains("Socket server failed to bind to")) {
    +            brokerPort += 1
    +          }
    +        case e: Exception => throw new Exception("Kafka server create failed", e)
    +      }
    +    }
    +
    +    Thread.sleep(2000)
    +    brokerReady = true
    +  }
    +
    +  /** setup the whole embedded servers, including Zookeeper and Kafka brokers */
    +  def setup(): Unit = {
    +    setupEmbeddedZookeeper()
    +    setupEmbeddedKafkaServer()
    +  }
    +
    +  /** Teardown the whole servers, including Kafka broker and Zookeeper */
    +  def teardown(): Unit = {
    +    brokerReady = false
    +    zkReady = false
    +
    +    if (producer != null) {
    +      producer.close()
    +      producer = null
    +    }
    +
    +    if (server != null) {
    +      server.shutdown()
    +      server = null
    +    }
    +
    +    brokerConf.logDirs.foreach { f => Utils.deleteRecursively(new File(f)) }
    +
    +    if (zkClient != null) {
    +      zkClient.close()
    +      zkClient = null
    +    }
    +
    +    if (zookeeper != null) {
    +      zookeeper.shutdown()
    +      zookeeper = null
    +    }
    +  }
    +
    +  /** 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)
    +  }
    +
    +  /** 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: _*))
    +  }
    +
    +  /** 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)
    +  }
    +
    +  /** Send the array of messages to the Kafka broker */
    +  def sendMessages(topic: String, messages: Array[String]): Unit = {
    +    producer = new Producer[String, String](new ProducerConfig(producerConfigure))
    +    producer.send(messages.map { new KeyedMessage[String, String](topic, _ ) }: _*)
    +    producer.close()
    +    producer = null
    +  }
    +
    +  private def brokerConfigure: Properties = {
    --- End diff --
    
    brokerConfigure --> brokerConfiguration


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