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Added ContextCleaner to automatically clean RDDs and shuffles when th…
…ey fall out of scope. Also replaced TimeStampedHashMap to BoundedHashMaps and TimeStampedWeakValueHashMap for the necessary hashmap behavior.
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core/src/main/scala/org/apache/spark/ContextCleaner.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 | ||
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| import scala.collection.mutable.{ArrayBuffer, SynchronizedBuffer} | ||
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| import java.util.concurrent.{ArrayBlockingQueue, TimeUnit} | ||
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| import org.apache.spark.rdd.RDD | ||
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| /** Listener class used for testing when any item has been cleaned by the Cleaner class */ | ||
| private[spark] trait CleanerListener { | ||
| def rddCleaned(rddId: Int) | ||
| def shuffleCleaned(shuffleId: Int) | ||
| } | ||
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| /** | ||
| * Cleans RDDs and shuffle data. This should be instantiated only on the driver. | ||
| */ | ||
| private[spark] class ContextCleaner(env: SparkEnv) extends Logging { | ||
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| /** Classes to represent cleaning tasks */ | ||
| private sealed trait CleaningTask | ||
| private case class CleanRDD(sc: SparkContext, id: Int) extends CleaningTask | ||
| private case class CleanShuffle(id: Int) extends CleaningTask | ||
| // TODO: add CleanBroadcast | ||
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| private val QUEUE_CAPACITY = 1000 | ||
| private val queue = new ArrayBlockingQueue[CleaningTask](QUEUE_CAPACITY) | ||
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| protected val listeners = new ArrayBuffer[CleanerListener] | ||
| with SynchronizedBuffer[CleanerListener] | ||
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| private val cleaningThread = new Thread() { override def run() { keepCleaning() }} | ||
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| private var stopped = false | ||
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| /** Start the cleaner */ | ||
| def start() { | ||
| cleaningThread.setDaemon(true) | ||
| cleaningThread.start() | ||
| } | ||
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| /** Stop the cleaner */ | ||
| def stop() { | ||
| synchronized { stopped = true } | ||
| cleaningThread.interrupt() | ||
| } | ||
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| /** Clean all data and metadata related to a RDD, including shuffle files and metadata */ | ||
| def cleanRDD(rdd: RDD[_]) { | ||
| enqueue(CleanRDD(rdd.sparkContext, rdd.id)) | ||
| logDebug("Enqueued RDD " + rdd + " for cleaning up") | ||
| } | ||
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| def cleanShuffle(shuffleId: Int) { | ||
| enqueue(CleanShuffle(shuffleId)) | ||
| logDebug("Enqueued shuffle " + shuffleId + " for cleaning up") | ||
| } | ||
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| def attachListener(listener: CleanerListener) { | ||
| listeners += listener | ||
| } | ||
| /** Enqueue a cleaning task */ | ||
| private def enqueue(task: CleaningTask) { | ||
| queue.put(task) | ||
| } | ||
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| /** Keep cleaning RDDs and shuffle data */ | ||
| private def keepCleaning() { | ||
| try { | ||
| while (!isStopped) { | ||
| val taskOpt = Option(queue.poll(100, TimeUnit.MILLISECONDS)) | ||
| if (taskOpt.isDefined) { | ||
| logDebug("Got cleaning task " + taskOpt.get) | ||
| taskOpt.get match { | ||
| case CleanRDD(sc, rddId) => doCleanRDD(sc, rddId) | ||
| case CleanShuffle(shuffleId) => doCleanShuffle(shuffleId) | ||
| } | ||
| } | ||
| } | ||
| } catch { | ||
| case ie: java.lang.InterruptedException => | ||
| if (!isStopped) logWarning("Cleaning thread interrupted") | ||
| } | ||
| } | ||
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| /** Perform RDD cleaning */ | ||
| private def doCleanRDD(sc: SparkContext, rddId: Int) { | ||
| logDebug("Cleaning rdd "+ rddId) | ||
| sc.env.blockManager.master.removeRdd(rddId, false) | ||
| sc.persistentRdds.remove(rddId) | ||
| listeners.foreach(_.rddCleaned(rddId)) | ||
| logInfo("Cleaned rdd "+ rddId) | ||
| } | ||
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| /** Perform shuffle cleaning */ | ||
| private def doCleanShuffle(shuffleId: Int) { | ||
| logDebug("Cleaning shuffle "+ shuffleId) | ||
| mapOutputTrackerMaster.unregisterShuffle(shuffleId) | ||
| blockManager.master.removeShuffle(shuffleId) | ||
| listeners.foreach(_.shuffleCleaned(shuffleId)) | ||
| logInfo("Cleaned shuffle " + shuffleId) | ||
| } | ||
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| private def mapOutputTrackerMaster = env.mapOutputTracker.asInstanceOf[MapOutputTrackerMaster] | ||
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| private def blockManager = env.blockManager | ||
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| private def isStopped = synchronized { stopped } | ||
| } |
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