| /* |
| * 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.samza.system.hdfs |
| |
| |
| import org.apache.hadoop.conf.Configuration |
| import org.apache.hadoop.fs.FileSystem |
| import org.apache.samza.system.hdfs.writer.HdfsWriter |
| import org.apache.samza.system.{OutgoingMessageEnvelope, SystemProducer} |
| import org.apache.samza.util.{Logging, TimerUtil} |
| |
| import scala.collection.mutable.{Map => MMap} |
| |
| |
| class HdfsSystemProducer( |
| systemName: String, clientId: String, config: HdfsConfig, metrics: HdfsSystemProducerMetrics, |
| val clock: () => Long = () => System.currentTimeMillis) extends SystemProducer with Logging with TimerUtil { |
| val dfs = FileSystem.newInstance(new Configuration(true)) |
| val writers: MMap[String, HdfsWriter[_]] = MMap.empty[String, HdfsWriter[_]] |
| private val lock = new Object //synchronization lock for thread safe access |
| |
| def start(): Unit = { |
| info("entering HdfsSystemProducer.start() call for system: " + systemName + ", client: " + clientId) |
| } |
| |
| def stop(): Unit = { |
| info("entering HdfsSystemProducer.stop() for system: " + systemName + ", client: " + clientId) |
| |
| lock.synchronized { |
| writers.values.map(_.close) |
| dfs.close |
| } |
| } |
| |
| def register(source: String): Unit = { |
| info("entering HdfsSystemProducer.register(" + source + ") " + |
| "call for system: " + systemName + ", client: " + clientId) |
| |
| lock.synchronized { |
| writers += (source -> HdfsWriter.getInstance(dfs, systemName, config)) |
| } |
| } |
| |
| def flush(source: String): Unit = { |
| debug("entering HdfsSystemProducer.flush(" + source + ") " + |
| "call for system: " + systemName + ", client: " + clientId) |
| |
| metrics.flushes.inc |
| lock.synchronized { |
| try { |
| updateTimer(metrics.flushMs) { |
| writers.get(source).head.flush |
| } |
| } catch { |
| case e: Exception => { |
| metrics.flushFailed.inc |
| warn("Exception thrown while client " + clientId + " flushed HDFS out stream, msg: " + e.getMessage) |
| debug("Detailed message from exception thrown by client " + clientId + " in HDFS flush: ", e) |
| writers.get(source).head.close |
| throw e |
| } |
| } |
| } |
| metrics.flushSuccess.inc |
| } |
| |
| def send(source: String, ome: OutgoingMessageEnvelope) = { |
| debug("entering HdfsSystemProducer.send(source = " + source + ", envelope) " + |
| "call for system: " + systemName + ", client: " + clientId) |
| |
| metrics.sends.inc |
| lock.synchronized { |
| try { |
| updateTimer(metrics.sendMs) { |
| writers.get(source).head.write(ome) |
| } |
| } catch { |
| case e: Exception => { |
| metrics.sendFailed.inc |
| warn("Exception thrown while client " + clientId + " wrote to HDFS, msg: " + e.getMessage) |
| debug("Detailed message from exception thrown by client " + clientId + " in HDFS write: ", e) |
| writers.get(source).head.close |
| throw e |
| } |
| } |
| } |
| metrics.sendSuccess.inc |
| } |
| } |