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Rewrite Kafka client master and worker (#731)
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131 changes: 131 additions & 0 deletions
131
wherehows-kafka/src/main/java/wherehows/actors/KafkaClientMaster.java
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| @@ -0,0 +1,131 @@ | ||
| /** | ||
| * Copyright 2015 LinkedIn Corp. All rights reserved. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
| package wherehows.actors; | ||
|
|
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| import akka.actor.ActorRef; | ||
| import akka.actor.Props; | ||
| import akka.actor.UntypedActor; | ||
| import java.lang.reflect.Constructor; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Properties; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.avro.generic.IndexedRecord; | ||
| import org.apache.kafka.clients.consumer.KafkaConsumer; | ||
| import org.apache.kafka.clients.producer.KafkaProducer; | ||
| import wherehows.common.Constant; | ||
| import wherehows.common.utils.JobsUtil; | ||
| import wherehows.dao.DaoFactory; | ||
| import wherehows.msgs.KafkaCommMsg; | ||
| import wherehows.processors.KafkaMessageProcessor; | ||
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| import static wherehows.main.ApplicationStart.DAO_FACTORY; | ||
| import static wherehows.utils.KafkaClientUtil.*; | ||
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| @Slf4j | ||
| public class KafkaClientMaster extends UntypedActor { | ||
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| private final String KAFKA_JOB_DIR; | ||
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| // Map of kafka job name to properties | ||
| private static Map<String, Properties> _kafkaJobList; | ||
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| // Map of kafka job name to worker actor | ||
| private static Map<String, ActorRef> _kafkaWorkers = new HashMap<>(); | ||
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| public KafkaClientMaster(String kafkaJobDir) { | ||
| this.KAFKA_JOB_DIR = kafkaJobDir; | ||
| } | ||
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| @Override | ||
| public void preStart() throws Exception { | ||
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| _kafkaJobList = JobsUtil.getEnabledJobs(KAFKA_JOB_DIR); | ||
| log.info("Kafka jobs: {}", _kafkaJobList.keySet()); | ||
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| if (_kafkaJobList.size() == 0) { | ||
| context().stop(getSelf()); | ||
| return; | ||
| } | ||
| log.info("Starting KafkaClientMaster..."); | ||
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| for (Map.Entry<String, Properties> entry : _kafkaJobList.entrySet()) { | ||
| // handle one kafka topic | ||
| final String kafkaJobName = entry.getKey(); | ||
| final Properties props = entry.getValue(); | ||
| log.info("Create Kafka client with config: " + props); | ||
| try { | ||
| final String consumerTopic = props.getProperty(Constant.KAFKA_CONSUMER_TOPIC_KEY, null); | ||
| final String processor = props.getProperty(Constant.KAFKA_PROCESSOR_KEY, null); | ||
| final String producerTopic = props.getProperty(Constant.KAFKA_PRODUCER_TOPIC_KEY, null); | ||
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| if (consumerTopic == null || processor == null) { | ||
| log.error("Missing required configs for: " + kafkaJobName); | ||
| continue; | ||
| } | ||
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| // create consumer | ||
| Properties consumerProp = getPropertyTrimPrefix(props, "consumer"); | ||
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| KafkaConsumer<String, IndexedRecord> consumer = getConsumer(consumerProp); | ||
| consumer.subscribe(Collections.singletonList(consumerTopic)); | ||
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| // create producer if configured | ||
| KafkaProducer<String, IndexedRecord> producer = null; | ||
| if (producerTopic != null) { | ||
| Properties producerProp = getPropertyTrimPrefix(props, "producer"); | ||
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| producer = getProducer(producerProp); | ||
| } | ||
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| // get processor instance | ||
| Class processorClass = Class.forName(processor); | ||
| Constructor<?> ctor = processorClass.getConstructor(DaoFactory.class, KafkaProducer.class); | ||
| KafkaMessageProcessor processorInstance = (KafkaMessageProcessor) ctor.newInstance(DAO_FACTORY, producer); | ||
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| // create worker | ||
| ActorRef worker = | ||
| getContext().actorOf(Props.create(KafkaWorker.class, consumerTopic, consumer, processorInstance)); | ||
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| _kafkaWorkers.put(consumerTopic, worker); | ||
| worker.tell("ApplicationStart", getSelf()); | ||
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| log.info("Started Kafka job: " + kafkaJobName + " listening to topic: " + consumerTopic); | ||
| } catch (Exception e) { | ||
| log.error("Error starting Kafka job: " + kafkaJobName, e); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void onReceive(Object message) throws Exception { | ||
| if (message instanceof KafkaCommMsg) { | ||
| final KafkaCommMsg kafkaCommMsg = (KafkaCommMsg) message; | ||
| log.debug(kafkaCommMsg.toString()); | ||
| } else { | ||
| unhandled(message); | ||
| } | ||
| } | ||
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| @Override | ||
| public void postStop() throws Exception { | ||
| log.info("Terminating KafkaClientMaster..."); | ||
| KafkaWorker.RUNNING = false; | ||
| for (ActorRef worker : _kafkaWorkers.values()) { | ||
| getContext().stop(worker); | ||
| } | ||
| } | ||
| } |
96 changes: 96 additions & 0 deletions
96
wherehows-kafka/src/main/java/wherehows/actors/KafkaWorker.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,96 @@ | ||
| /** | ||
| * Copyright 2015 LinkedIn Corp. All rights reserved. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
| package wherehows.actors; | ||
|
|
||
| import akka.actor.UntypedActor; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.avro.generic.IndexedRecord; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecord; | ||
| import org.apache.kafka.clients.consumer.ConsumerRecords; | ||
| import org.apache.kafka.clients.consumer.KafkaConsumer; | ||
| import wherehows.processors.KafkaMessageProcessor; | ||
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| /** | ||
| * Akka actor for listening to a Kafka topic and waiting for messages. | ||
| */ | ||
| @Slf4j | ||
| public class KafkaWorker extends UntypedActor { | ||
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| public static boolean RUNNING = true; | ||
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| private final String _topic; | ||
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| private final KafkaConsumer<String, IndexedRecord> _consumer; | ||
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| private final KafkaMessageProcessor _processor; | ||
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| private final int _consumer_poll_interval = 1000; | ||
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| private int _receivedRecordCount; | ||
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| public KafkaWorker(String topic, KafkaConsumer<String, IndexedRecord> consumer, KafkaMessageProcessor processor) { | ||
| this._topic = topic; | ||
| this._consumer = consumer; | ||
| this._processor = processor; | ||
| this._receivedRecordCount = 0; // number of received kafka messages | ||
| } | ||
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| @Override | ||
| public void onReceive(Object message) throws Exception { | ||
| if (message.equals("ApplicationStart")) { | ||
| try { | ||
| while (RUNNING) { | ||
| ConsumerRecords<String, IndexedRecord> records = _consumer.poll(_consumer_poll_interval); | ||
| for (ConsumerRecord<String, IndexedRecord> record : records) { | ||
| _receivedRecordCount++; | ||
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| try { | ||
| _processor.process(record.value()); | ||
| } catch (Exception e) { | ||
| log.error("Processor Error: ", e); | ||
| } | ||
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| if (_receivedRecordCount % 1000 == 0) { | ||
| log.debug(_topic + " received " + _receivedRecordCount); | ||
| } | ||
| } | ||
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| _consumer.commitSync(); | ||
| } | ||
| } catch (Exception e) { | ||
| log.error("Consumer Error ", e); | ||
| } finally { | ||
| log.info("Shutting down consumer and worker for topic: " + _topic); | ||
| try { | ||
| _consumer.close(); | ||
| } catch (Exception e) { | ||
| log.error("Error closing consumer for topic " + _topic + " : " + e.toString()); | ||
| } | ||
| } | ||
| } else { | ||
| unhandled(message); | ||
| } | ||
| } | ||
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| @Override | ||
| public void postStop() throws Exception { | ||
| log.info("Stop worker for topic: " + _topic); | ||
| try { | ||
| _consumer.close(); | ||
| } catch (Exception e) { | ||
| log.error("Error closing consumer for topic " + _topic + " : " + e.toString()); | ||
| } | ||
| } | ||
| } |
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