| /* |
| * 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.giraph.utils; |
| |
| import org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable; |
| import org.apache.giraph.conf.GiraphConstants; |
| import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration; |
| import org.apache.giraph.master.MasterObserver; |
| import org.apache.giraph.metrics.AggregatedMetrics; |
| import org.apache.giraph.partition.PartitionStats; |
| import org.apache.giraph.worker.WorkerObserver; |
| import org.apache.log4j.Logger; |
| |
| import java.util.List; |
| |
| /** |
| * An observer for both worker and master that periodically checks if available |
| * memory on heap is below certain threshold, and if found to be the case |
| * dumps jmap -histo for the process |
| */ |
| public class ReactiveJMapHistoDumper extends |
| DefaultImmutableClassesGiraphConfigurable implements |
| MasterObserver, WorkerObserver { |
| /** Logger */ |
| private static final Logger LOG = Logger.getLogger( |
| ReactiveJMapHistoDumper.class); |
| /** Size of mb */ |
| private static final int MB = 1024 * 1024; |
| |
| /** How many msec to sleep between calls */ |
| private int sleepMillis; |
| /** How many lines of output to print */ |
| private int linesToPrint; |
| /** How much free memory is expected */ |
| private int minFreeMemory; |
| |
| /** The jmap printing thread */ |
| private Thread thread; |
| /** Halt jmap thread */ |
| private volatile boolean stop = false; |
| /** Path to jmap*/ |
| private String jmapPath; |
| |
| @Override |
| public void preLoad() { |
| // This is called by both WorkerObserver and MasterObserver |
| startSupervisorThread(); |
| } |
| |
| @Override |
| public void postSave() { |
| // This is called by both WorkerObserver and MasterObserver |
| joinSupervisorThread(); |
| } |
| |
| @Override |
| public void preApplication() { |
| } |
| |
| @Override |
| public void postApplication() { |
| } |
| |
| /** |
| * Join the supervisor thread |
| */ |
| private void joinSupervisorThread() { |
| stop = true; |
| try { |
| thread.join(sleepMillis + 5000); |
| } catch (InterruptedException e) { |
| LOG.error("Failed to join jmap thread"); |
| } |
| } |
| |
| /** |
| * Start the supervisor thread |
| */ |
| public void startSupervisorThread() { |
| stop = false; |
| final Runtime runtime = Runtime.getRuntime(); |
| thread = ThreadUtils.startThread(new Runnable() { |
| @Override |
| public void run() { |
| while (!stop) { |
| long potentialMemory = (runtime.maxMemory() - |
| runtime.totalMemory()) + runtime.freeMemory(); |
| if (potentialMemory / MB < minFreeMemory) { |
| JMap.heapHistogramDump(linesToPrint, jmapPath); |
| } |
| ThreadUtils.trySleep(sleepMillis); |
| } |
| } |
| }, "ReactiveJMapHistoDumperSupervisorThread"); |
| } |
| |
| @Override |
| public void preSuperstep(long superstep) { } |
| |
| @Override |
| public void postSuperstep(long superstep) { } |
| |
| @Override |
| public void superstepMetricsUpdate(long superstep, |
| AggregatedMetrics aggregatedMetrics, |
| List<PartitionStats> partitionStatsList) { } |
| |
| @Override |
| public void applicationFailed(Exception e) { } |
| |
| @Override |
| public void setConf(ImmutableClassesGiraphConfiguration configuration) { |
| sleepMillis = GiraphConstants.JMAP_SLEEP_MILLIS.get(configuration); |
| linesToPrint = GiraphConstants.JMAP_PRINT_LINES.get(configuration); |
| minFreeMemory = GiraphConstants.MIN_FREE_MBS_ON_HEAP.get(configuration); |
| jmapPath = GiraphConstants.JMAP_PATH.get(configuration); |
| } |
| } |