Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/126#discussion_r10553293
--- Diff: core/src/main/scala/org/apache/spark/ContextCleaner.scala ---
@@ -0,0 +1,135 @@
+/*
+ * 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.spark
+
+import scala.collection.mutable.{ArrayBuffer, SynchronizedBuffer}
+
+import java.util.concurrent.{LinkedBlockingQueue, TimeUnit}
+
+/** 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)
+}
+
+/**
+ * Cleans RDDs and shuffle data.
+ */
+private[spark] class ContextCleaner(sc: SparkContext) extends Logging {
+
+ /** Classes to represent cleaning tasks */
+ private sealed trait CleaningTask
+ private case class CleanRDD(rddId: Int) extends CleaningTask
+ private case class CleanShuffle(shuffleId: Int) extends CleaningTask
+ // TODO: add CleanBroadcast
+
+ private val queue = new LinkedBlockingQueue[CleaningTask]
+
+ protected val listeners = new ArrayBuffer[CleanerListener]
+ with SynchronizedBuffer[CleanerListener]
+
+ private val cleaningThread = new Thread() { override def run() {
keepCleaning() }}
+
+ @volatile private var stopped = false
+
+ /** Start the cleaner */
+ def start() {
+ cleaningThread.setDaemon(true)
+ cleaningThread.start()
+ }
+
+ /** Stop the cleaner */
+ def stop() {
+ stopped = true
+ cleaningThread.interrupt()
+ }
+
+ /**
+ * Clean (unpersist) RDD data. Do not perform any time or resource
intensive
+ * computation in this function as this is called from a finalize()
function.
+ */
+ def cleanRDD(rddId: Int) {
+ enqueue(CleanRDD(rddId))
+ logDebug("Enqueued RDD " + rddId + " for cleaning up")
+ }
+
+ /**
+ * Clean shuffle data. Do not perform any time or resource intensive
+ * computation in this function as this is called from a finalize()
function.
+ */
+ def cleanShuffle(shuffleId: Int) {
+ enqueue(CleanShuffle(shuffleId))
+ logDebug("Enqueued shuffle " + shuffleId + " for cleaning up")
+ }
+
+ /** Attach a listener object to get information of when objects are
cleaned. */
+ def attachListener(listener: CleanerListener) {
+ listeners += listener
+ }
+
+ /**
+ * Enqueue a cleaning task. Do not perform any time or resource intensive
+ * computation in this function as this is called from a finalize()
function.
+ */
+ private def enqueue(task: CleaningTask) {
+ queue.put(task)
+ }
+
+ /** Keep cleaning RDDs and shuffle data */
+ private def keepCleaning() {
+ try {
+ while (!isStopped) {
+ val taskOpt = Option(queue.poll(100, TimeUnit.MILLISECONDS))
+ taskOpt.foreach(task => {
--- End diff --
Done.
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