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Initial commit for reliable Kafka receiver
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external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaReceiver.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 scala.collection.Map | ||
| import scala.reflect.{classTag, ClassTag} | ||
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| import java.util.Properties | ||
| import java.util.concurrent.Executors | ||
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| import kafka.consumer._ | ||
| import kafka.serializer.Decoder | ||
| import kafka.utils.VerifiableProperties | ||
| import kafka.utils.ZKStringSerializer | ||
| import org.I0Itec.zkclient._ | ||
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| import org.apache.spark.Logging | ||
| import org.apache.spark.storage.StorageLevel | ||
| import org.apache.spark.streaming.receiver.Receiver | ||
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| private[streaming] | ||
| class KafkaReceiver[ | ||
| K: ClassTag, | ||
| V: ClassTag, | ||
| U <: Decoder[_]: ClassTag, | ||
| T <: Decoder[_]: ClassTag]( | ||
| kafkaParams: Map[String, String], | ||
| topics: Map[String, Int], | ||
| storageLevel: StorageLevel | ||
| ) extends Receiver[Any](storageLevel) with Logging { | ||
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| // Connection to Kafka | ||
| var consumerConnector: ConsumerConnector = null | ||
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| def onStop() { | ||
| if (consumerConnector != null) { | ||
| consumerConnector.shutdown() | ||
| } | ||
| } | ||
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| def onStart() { | ||
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| logInfo("Starting Kafka Consumer Stream with group: " + kafkaParams("group.id")) | ||
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| // Kafka connection properties | ||
| val props = new Properties() | ||
| kafkaParams.foreach(param => props.put(param._1, param._2)) | ||
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| val zkConnect = kafkaParams("zookeeper.connect") | ||
| // Create the connection to the cluster | ||
| logInfo("Connecting to Zookeeper: " + zkConnect) | ||
| val consumerConfig = new ConsumerConfig(props) | ||
| consumerConnector = Consumer.create(consumerConfig) | ||
| logInfo("Connected to " + zkConnect) | ||
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| // When auto.offset.reset is defined, it is our responsibility to try and whack the | ||
| // consumer group zk node. | ||
| if (kafkaParams.contains("auto.offset.reset")) { | ||
| tryZookeeperConsumerGroupCleanup(zkConnect, kafkaParams("group.id")) | ||
| } | ||
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| val keyDecoder = classTag[U].runtimeClass.getConstructor(classOf[VerifiableProperties]) | ||
| .newInstance(consumerConfig.props) | ||
| .asInstanceOf[Decoder[K]] | ||
| val valueDecoder = classTag[T].runtimeClass.getConstructor(classOf[VerifiableProperties]) | ||
| .newInstance(consumerConfig.props) | ||
| .asInstanceOf[Decoder[V]] | ||
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| // Create Threads for each Topic/Message Stream we are listening | ||
| val topicMessageStreams = consumerConnector.createMessageStreams( | ||
| topics, keyDecoder, valueDecoder) | ||
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| val executorPool = Executors.newFixedThreadPool(topics.values.sum) | ||
| try { | ||
| // Start the messages handler for each partition | ||
| topicMessageStreams.values.foreach { streams => | ||
| streams.foreach { stream => executorPool.submit(new MessageHandler(stream)) } | ||
| } | ||
| } finally { | ||
| executorPool.shutdown() // Just causes threads to terminate after work is done | ||
| } | ||
| } | ||
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| // Handles Kafka Messages | ||
| private class MessageHandler[K: ClassTag, V: ClassTag](stream: KafkaStream[K, V]) | ||
| extends Runnable { | ||
| def run() { | ||
| logInfo("Starting MessageHandler.") | ||
| try { | ||
| for (msgAndMetadata <- stream) { | ||
| store((msgAndMetadata.key, msgAndMetadata.message)) | ||
| } | ||
| } catch { | ||
| case e: Throwable => logError("Error handling message; exiting", e) | ||
| } | ||
| } | ||
| } | ||
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| // It is our responsibility to delete the consumer group when specifying auto.offset.reset. This | ||
| // is because Kafka 0.7.2 only honors this param when the group is not in zookeeper. | ||
| // | ||
| // The kafka high level consumer doesn't expose setting offsets currently, this is a trick copied | ||
| // from Kafka's ConsoleConsumer. See code related to 'auto.offset.reset' when it is set to | ||
| // 'smallest'/'largest': | ||
| // scalastyle:off | ||
| // https://github.com/apache/kafka/blob/0.7.2/core/src/main/scala/kafka/consumer/ConsoleConsumer.scala | ||
| // scalastyle:on | ||
| private def tryZookeeperConsumerGroupCleanup(zkUrl: String, groupId: String) { | ||
| val dir = "/consumers/" + groupId | ||
| logInfo("Cleaning up temporary Zookeeper data under " + dir + ".") | ||
| val zk = new ZkClient(zkUrl, 30*1000, 30*1000, ZKStringSerializer) | ||
| try { | ||
| zk.deleteRecursive(dir) | ||
| } catch { | ||
| case e: Throwable => logWarning("Error cleaning up temporary Zookeeper data", e) | ||
| } finally { | ||
| zk.close() | ||
| } | ||
| } | ||
| } |
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