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| .*\.q | ||
| golden | ||
| test.out/* | ||
| .*iml | ||
| .*iml | ||
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192 changes: 192 additions & 0 deletions
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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 java.lang.ref.{ReferenceQueue, WeakReference} | ||
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| import scala.collection.mutable.{ArrayBuffer, SynchronizedBuffer} | ||
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| import org.apache.spark.broadcast.Broadcast | ||
| import org.apache.spark.rdd.RDD | ||
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| /** | ||
| * Classes that represent cleaning tasks. | ||
| */ | ||
| private sealed trait CleanupTask | ||
| private case class CleanRDD(rddId: Int) extends CleanupTask | ||
| private case class CleanShuffle(shuffleId: Int) extends CleanupTask | ||
| private case class CleanBroadcast(broadcastId: Long) extends CleanupTask | ||
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| /** | ||
| * A WeakReference associated with a CleanupTask. | ||
| * | ||
| * When the referent object becomes only weakly reachable, the corresponding | ||
| * CleanupTaskWeakReference is automatically added to the given reference queue. | ||
| */ | ||
| private class CleanupTaskWeakReference( | ||
| val task: CleanupTask, | ||
| referent: AnyRef, | ||
| referenceQueue: ReferenceQueue[AnyRef]) | ||
| extends WeakReference(referent, referenceQueue) | ||
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| /** | ||
| * An asynchronous cleaner for RDD, shuffle, and broadcast state. | ||
| * | ||
| * This maintains a weak reference for each RDD, ShuffleDependency, and Broadcast of interest, | ||
| * to be processed when the associated object goes out of scope of the application. Actual | ||
| * cleanup is performed in a separate daemon thread. | ||
| */ | ||
| private[spark] class ContextCleaner(sc: SparkContext) extends Logging { | ||
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| private val referenceBuffer = new ArrayBuffer[CleanupTaskWeakReference] | ||
| with SynchronizedBuffer[CleanupTaskWeakReference] | ||
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| private val referenceQueue = new ReferenceQueue[AnyRef] | ||
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| private 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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| /** | ||
| * Whether the cleaning thread will block on cleanup tasks. | ||
| * This is set to true only for tests. | ||
| */ | ||
| private val blockOnCleanupTasks = sc.conf.getBoolean( | ||
| "spark.cleaner.referenceTracking.blocking", false) | ||
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| @volatile private var stopped = false | ||
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| /** Attach a listener object to get information of when objects are cleaned. */ | ||
| def attachListener(listener: CleanerListener) { | ||
| listeners += listener | ||
| } | ||
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| /** Start the cleaner. */ | ||
| def start() { | ||
| cleaningThread.setDaemon(true) | ||
| cleaningThread.setName("Spark Context Cleaner") | ||
| cleaningThread.start() | ||
| } | ||
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| /** Stop the cleaner. */ | ||
| def stop() { | ||
| stopped = true | ||
| } | ||
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| /** Register a RDD for cleanup when it is garbage collected. */ | ||
| def registerRDDForCleanup(rdd: RDD[_]) { | ||
| registerForCleanup(rdd, CleanRDD(rdd.id)) | ||
| } | ||
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| /** Register a ShuffleDependency for cleanup when it is garbage collected. */ | ||
| def registerShuffleForCleanup(shuffleDependency: ShuffleDependency[_, _]) { | ||
| registerForCleanup(shuffleDependency, CleanShuffle(shuffleDependency.shuffleId)) | ||
| } | ||
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| /** Register a Broadcast for cleanup when it is garbage collected. */ | ||
| def registerBroadcastForCleanup[T](broadcast: Broadcast[T]) { | ||
| registerForCleanup(broadcast, CleanBroadcast(broadcast.id)) | ||
| } | ||
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| /** Register an object for cleanup. */ | ||
| private def registerForCleanup(objectForCleanup: AnyRef, task: CleanupTask) { | ||
| referenceBuffer += new CleanupTaskWeakReference(task, objectForCleanup, referenceQueue) | ||
| } | ||
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| /** Keep cleaning RDD, shuffle, and broadcast state. */ | ||
| private def keepCleaning() { | ||
| while (!stopped) { | ||
| try { | ||
| val reference = Option(referenceQueue.remove(ContextCleaner.REF_QUEUE_POLL_TIMEOUT)) | ||
| .map(_.asInstanceOf[CleanupTaskWeakReference]) | ||
| reference.map(_.task).foreach { task => | ||
| logDebug("Got cleaning task " + task) | ||
| referenceBuffer -= reference.get | ||
| task match { | ||
| case CleanRDD(rddId) => | ||
| doCleanupRDD(rddId, blocking = blockOnCleanupTasks) | ||
| case CleanShuffle(shuffleId) => | ||
| doCleanupShuffle(shuffleId, blocking = blockOnCleanupTasks) | ||
| case CleanBroadcast(broadcastId) => | ||
| doCleanupBroadcast(broadcastId, blocking = blockOnCleanupTasks) | ||
| } | ||
| } | ||
| } catch { | ||
| case t: Throwable => logError("Error in cleaning thread", t) | ||
| } | ||
| } | ||
| } | ||
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| /** Perform RDD cleanup. */ | ||
| def doCleanupRDD(rddId: Int, blocking: Boolean) { | ||
| try { | ||
| logDebug("Cleaning RDD " + rddId) | ||
| sc.unpersistRDD(rddId, blocking) | ||
| listeners.foreach(_.rddCleaned(rddId)) | ||
| logInfo("Cleaned RDD " + rddId) | ||
| } catch { | ||
| case t: Throwable => logError("Error cleaning RDD " + rddId, t) | ||
| } | ||
| } | ||
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| /** Perform shuffle cleanup, asynchronously. */ | ||
| def doCleanupShuffle(shuffleId: Int, blocking: Boolean) { | ||
| try { | ||
| logDebug("Cleaning shuffle " + shuffleId) | ||
| mapOutputTrackerMaster.unregisterShuffle(shuffleId) | ||
| blockManagerMaster.removeShuffle(shuffleId, blocking) | ||
| listeners.foreach(_.shuffleCleaned(shuffleId)) | ||
| logInfo("Cleaned shuffle " + shuffleId) | ||
| } catch { | ||
| case t: Throwable => logError("Error cleaning shuffle " + shuffleId, t) | ||
| } | ||
| } | ||
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| /** Perform broadcast cleanup. */ | ||
| def doCleanupBroadcast(broadcastId: Long, blocking: Boolean) { | ||
| try { | ||
| logDebug("Cleaning broadcast " + broadcastId) | ||
| broadcastManager.unbroadcast(broadcastId, true, blocking) | ||
| listeners.foreach(_.broadcastCleaned(broadcastId)) | ||
| logInfo("Cleaned broadcast " + broadcastId) | ||
| } catch { | ||
| case t: Throwable => logError("Error cleaning broadcast " + broadcastId, t) | ||
| } | ||
| } | ||
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| private def blockManagerMaster = sc.env.blockManager.master | ||
| private def broadcastManager = sc.env.broadcastManager | ||
| private def mapOutputTrackerMaster = sc.env.mapOutputTracker.asInstanceOf[MapOutputTrackerMaster] | ||
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| // Used for testing. These methods explicitly blocks until cleanup is completed | ||
| // to ensure that more reliable testing. | ||
| } | ||
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| private object ContextCleaner { | ||
| private val REF_QUEUE_POLL_TIMEOUT = 100 | ||
| } | ||
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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) | ||
| def broadcastCleaned(broadcastId: Long) | ||
| } |
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