Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4961#discussion_r27717233
--- 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 = {
+ 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
+ }
+
+ private def producerConfigure: Properties = {
+ val props = new Properties()
+ props.put("metadata.broker.list", brokerAddress)
+ props.put("serializer.class", classOf[StringEncoder].getName)
+ props
+ }
+
+ private def waitUntilMetadataIsPropagated(topic: String, partition:
Int): Unit = {
+ // A simplified version of scalatest eventually, rewrite here is 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)
+ }
+ }
+
+ 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)
+ }
+
+ tryAgain(attempt + 1)
+ }
+ }
+
+ tryAgain(1)
+ }
+
+ eventually(Time(10000), Time(100)) {
+ assert(
+ server.apis.metadataCache.containsTopicAndPartition(topic,
partition),
+ s"Partition [$topic, $partition] metadata not propagated after
timeout"
+ )
+ }
+ }
+
+ private class EmbeddedZookeeper(val zkConnect: String) {
+ val random = new Random()
--- End diff --
This variable looks unused?
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