/
TaskAttemptImpl.java
executable file
·2317 lines (2113 loc) · 93.7 KB
/
TaskAttemptImpl.java
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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.
*/
package org.apache.hadoop.mapreduce.v2.app.job.impl;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DataOutputBuffer;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.JobContext;
import org.apache.hadoop.mapred.MapReduceChildJVM;
import org.apache.hadoop.mapred.ShuffleHandler;
import org.apache.hadoop.mapred.Task;
import org.apache.hadoop.mapred.TaskAttemptContextImpl;
import org.apache.hadoop.mapred.WrappedJvmID;
import org.apache.hadoop.mapred.WrappedProgressSplitsBlock;
import org.apache.hadoop.mapreduce.Counter;
import org.apache.hadoop.mapreduce.Counters;
import org.apache.hadoop.mapreduce.JobCounter;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.OutputCommitter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.TaskCounter;
import org.apache.hadoop.mapreduce.TypeConverter;
import org.apache.hadoop.mapreduce.jobhistory.JobHistoryEvent;
import org.apache.hadoop.mapreduce.jobhistory.JobHistoryParser.TaskAttemptInfo;
import org.apache.hadoop.mapreduce.jobhistory.MapAttemptFinishedEvent;
import org.apache.hadoop.mapreduce.jobhistory.ReduceAttemptFinishedEvent;
import org.apache.hadoop.mapreduce.jobhistory.TaskAttemptStartedEvent;
import org.apache.hadoop.mapreduce.jobhistory.TaskAttemptUnsuccessfulCompletionEvent;
import org.apache.hadoop.mapreduce.security.TokenCache;
import org.apache.hadoop.mapreduce.security.token.JobTokenIdentifier;
import org.apache.hadoop.mapreduce.v2.api.records.Avataar;
import org.apache.hadoop.mapreduce.v2.api.records.Locality;
import org.apache.hadoop.mapreduce.v2.api.records.Phase;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptReport;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptState;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskType;
import org.apache.hadoop.mapreduce.v2.app.AppContext;
import org.apache.hadoop.mapreduce.v2.app.TaskAttemptListener;
import org.apache.hadoop.mapreduce.v2.app.commit.CommitterTaskAbortEvent;
import org.apache.hadoop.mapreduce.v2.app.job.TaskAttemptStateInternal;
import org.apache.hadoop.mapreduce.v2.app.job.event.JobCounterUpdateEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.JobDiagnosticsUpdateEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.JobEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.JobEventType;
import org.apache.hadoop.mapreduce.v2.app.job.event.JobTaskAttemptFetchFailureEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptContainerAssignedEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptContainerLaunchedEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptDiagnosticsUpdateEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEventType;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptKillEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptRecoverEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent.TaskAttemptStatus;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptTooManyFetchFailureEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskEventType;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskTAttemptEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskTAttemptKilledEvent;
import org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncher;
import org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncherEvent;
import org.apache.hadoop.mapreduce.v2.app.launcher.ContainerRemoteLaunchEvent;
import org.apache.hadoop.mapreduce.v2.app.rm.ContainerAllocator;
import org.apache.hadoop.mapreduce.v2.app.rm.ContainerAllocatorEvent;
import org.apache.hadoop.mapreduce.v2.app.rm.ContainerRequestEvent;
import org.apache.hadoop.mapreduce.v2.app.speculate.SpeculatorEvent;
import org.apache.hadoop.mapreduce.v2.util.MRApps;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.security.Credentials;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.util.StringInterner;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.yarn.api.ApplicationConstants.Environment;
import org.apache.hadoop.yarn.api.records.ApplicationAccessType;
import org.apache.hadoop.yarn.api.records.Container;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
import org.apache.hadoop.yarn.api.records.LocalResource;
import org.apache.hadoop.yarn.api.records.LocalResourceType;
import org.apache.hadoop.yarn.api.records.LocalResourceVisibility;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.api.records.URL;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
import org.apache.hadoop.yarn.state.InvalidStateTransitionException;
import org.apache.hadoop.yarn.state.MultipleArcTransition;
import org.apache.hadoop.yarn.state.SingleArcTransition;
import org.apache.hadoop.yarn.state.StateMachine;
import org.apache.hadoop.yarn.state.StateMachineFactory;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.RackResolver;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
/**
* Implementation of TaskAttempt interface.
*/
@SuppressWarnings({ "rawtypes" })
public abstract class TaskAttemptImpl implements
org.apache.hadoop.mapreduce.v2.app.job.TaskAttempt,
EventHandler<TaskAttemptEvent> {
static final Counters EMPTY_COUNTERS = new Counters();
private static final Log LOG = LogFactory.getLog(TaskAttemptImpl.class);
private static final long MEMORY_SPLITS_RESOLUTION = 1024; //TODO Make configurable?
private final static RecordFactory recordFactory = RecordFactoryProvider.getRecordFactory(null);
protected final JobConf conf;
protected final Path jobFile;
protected final int partition;
protected EventHandler eventHandler;
private final TaskAttemptId attemptId;
private final Clock clock;
private final org.apache.hadoop.mapred.JobID oldJobId;
private final TaskAttemptListener taskAttemptListener;
private final Resource resourceCapability;
protected Set<String> dataLocalHosts;
protected Set<String> dataLocalRacks;
private final List<String> diagnostics = new ArrayList<String>();
private final Lock readLock;
private final Lock writeLock;
private final AppContext appContext;
private Credentials credentials;
private Token<JobTokenIdentifier> jobToken;
private static AtomicBoolean initialClasspathFlag = new AtomicBoolean();
private static String initialClasspath = null;
private static String initialAppClasspath = null;
private static Object commonContainerSpecLock = new Object();
private static ContainerLaunchContext commonContainerSpec = null;
private static final Object classpathLock = new Object();
private long launchTime;
private long finishTime;
private WrappedProgressSplitsBlock progressSplitBlock;
private int shufflePort = -1;
private String trackerName;
private int httpPort;
private Locality locality;
private Avataar avataar;
private boolean rescheduleNextAttempt = false;
private static final CleanupContainerTransition
CLEANUP_CONTAINER_TRANSITION = new CleanupContainerTransition();
private static final MoveContainerToSucceededFinishingTransition
SUCCEEDED_FINISHING_TRANSITION =
new MoveContainerToSucceededFinishingTransition();
private static final MoveContainerToFailedFinishingTransition
FAILED_FINISHING_TRANSITION =
new MoveContainerToFailedFinishingTransition();
private static final ExitFinishingOnTimeoutTransition
FINISHING_ON_TIMEOUT_TRANSITION =
new ExitFinishingOnTimeoutTransition();
private static final FinalizeFailedTransition FINALIZE_FAILED_TRANSITION =
new FinalizeFailedTransition();
private static final DiagnosticInformationUpdater
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION
= new DiagnosticInformationUpdater();
private static final EnumSet<TaskAttemptEventType>
FAILED_KILLED_STATE_IGNORED_EVENTS = EnumSet.of(
TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_ASSIGNED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
TaskAttemptEventType.TA_UPDATE,
// Container launch events can arrive late
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_TIMED_OUT,
TaskAttemptEventType.TA_TOO_MANY_FETCH_FAILURE);
private static final StateMachineFactory
<TaskAttemptImpl, TaskAttemptStateInternal, TaskAttemptEventType, TaskAttemptEvent>
stateMachineFactory
= new StateMachineFactory
<TaskAttemptImpl, TaskAttemptStateInternal, TaskAttemptEventType, TaskAttemptEvent>
(TaskAttemptStateInternal.NEW)
// Transitions from the NEW state.
.addTransition(TaskAttemptStateInternal.NEW, TaskAttemptStateInternal.UNASSIGNED,
TaskAttemptEventType.TA_SCHEDULE, new RequestContainerTransition(false))
.addTransition(TaskAttemptStateInternal.NEW, TaskAttemptStateInternal.UNASSIGNED,
TaskAttemptEventType.TA_RESCHEDULE, new RequestContainerTransition(true))
.addTransition(TaskAttemptStateInternal.NEW, TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_KILL, new KilledTransition())
.addTransition(TaskAttemptStateInternal.NEW, TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT, new FailedTransition())
.addTransition(TaskAttemptStateInternal.NEW,
EnumSet.of(TaskAttemptStateInternal.FAILED,
TaskAttemptStateInternal.KILLED,
TaskAttemptStateInternal.SUCCEEDED),
TaskAttemptEventType.TA_RECOVER, new RecoverTransition())
.addTransition(TaskAttemptStateInternal.NEW,
TaskAttemptStateInternal.NEW,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Transitions from the UNASSIGNED state.
.addTransition(TaskAttemptStateInternal.UNASSIGNED,
TaskAttemptStateInternal.ASSIGNED, TaskAttemptEventType.TA_ASSIGNED,
new ContainerAssignedTransition())
.addTransition(TaskAttemptStateInternal.UNASSIGNED, TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_KILL, new DeallocateContainerTransition(
TaskAttemptStateInternal.KILLED, true))
.addTransition(TaskAttemptStateInternal.UNASSIGNED, TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT, new DeallocateContainerTransition(
TaskAttemptStateInternal.FAILED, true))
.addTransition(TaskAttemptStateInternal.UNASSIGNED,
TaskAttemptStateInternal.UNASSIGNED,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Transitions from the ASSIGNED state.
.addTransition(TaskAttemptStateInternal.ASSIGNED, TaskAttemptStateInternal.RUNNING,
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
new LaunchedContainerTransition())
.addTransition(TaskAttemptStateInternal.ASSIGNED, TaskAttemptStateInternal.ASSIGNED,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
.addTransition(TaskAttemptStateInternal.ASSIGNED, TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED,
new DeallocateContainerTransition(TaskAttemptStateInternal.FAILED, false))
.addTransition(TaskAttemptStateInternal.ASSIGNED,
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
FINALIZE_FAILED_TRANSITION)
.addTransition(TaskAttemptStateInternal.ASSIGNED,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_KILL, CLEANUP_CONTAINER_TRANSITION)
.addTransition(TaskAttemptStateInternal.ASSIGNED,
TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptEventType.TA_FAILMSG, FAILED_FINISHING_TRANSITION)
.addTransition(TaskAttemptStateInternal.ASSIGNED,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
CLEANUP_CONTAINER_TRANSITION)
// Transitions from RUNNING state.
.addTransition(TaskAttemptStateInternal.RUNNING, TaskAttemptStateInternal.RUNNING,
TaskAttemptEventType.TA_UPDATE, new StatusUpdater())
.addTransition(TaskAttemptStateInternal.RUNNING, TaskAttemptStateInternal.RUNNING,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// If no commit is required, task goes to finishing state
// This will give a chance for the container to exit by itself
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptEventType.TA_DONE, SUCCEEDED_FINISHING_TRANSITION)
// If commit is required, task goes through commit pending state.
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptEventType.TA_COMMIT_PENDING, new CommitPendingTransition())
// Failure handling while RUNNING
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptEventType.TA_FAILMSG, FAILED_FINISHING_TRANSITION)
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT, CLEANUP_CONTAINER_TRANSITION)
//for handling container exit without sending the done or fail msg
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
FINALIZE_FAILED_TRANSITION)
// Timeout handling while RUNNING
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_TIMED_OUT, CLEANUP_CONTAINER_TRANSITION)
// if container killed by AM shutting down
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_CONTAINER_CLEANED, new KilledTransition())
// Kill handling
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_KILL,
CLEANUP_CONTAINER_TRANSITION)
.addTransition(TaskAttemptStateInternal.RUNNING,
TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_PREEMPTED, new PreemptedTransition())
// Transitions from SUCCESS_FINISHING_CONTAINER state
// When the container exits by itself, the notification of container
// completed event will be routed via NM -> RM -> AM.
// After MRAppMaster gets notification from RM, it will generate
// TA_CONTAINER_COMPLETED event.
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptStateInternal.SUCCEEDED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
new ExitFinishingOnContainerCompletedTransition())
// Given TA notifies task T_ATTEMPT_SUCCEEDED when it transitions to
// SUCCESS_FINISHING_CONTAINER, it is possible to receive the event
// TA_CONTAINER_CLEANED in the following scenario.
// 1. It is the last task for the job.
// 2. After the task receives T_ATTEMPT_SUCCEEDED, it will notify job.
// 3. Job will be marked completed.
// 4. As part of MRAppMaster's shutdown, all containers will be killed.
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptStateInternal.SUCCEEDED,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
new ExitFinishingOnContainerCleanedupTransition())
// The client wants to kill the task. Given the task is in finishing
// state, it could go to succeeded state or killed state. If it is a
// reducer, it will go to succeeded state;
// otherwise, it goes to killed state.
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
EnumSet.of(TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP),
TaskAttemptEventType.TA_KILL,
new KilledAfterSucceededFinishingTransition())
// The attempt stays in finishing state for too long
// Let us clean up the container
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_TIMED_OUT, FINISHING_ON_TIMEOUT_TRANSITION)
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// ignore-able events
.addTransition(TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
EnumSet.of(TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT))
// Transitions from FAIL_FINISHING_CONTAINER state
// When the container exits by itself, the notification of container
// completed event will be routed via NM -> RM -> AM.
// After MRAppMaster gets notification from RM, it will generate
// TA_CONTAINER_COMPLETED event.
.addTransition(TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
new ExitFinishingOnContainerCompletedTransition())
// Given TA notifies task T_ATTEMPT_FAILED when it transitions to
// FAIL_FINISHING_CONTAINER, it is possible to receive the event
// TA_CONTAINER_CLEANED in the following scenario.
// 1. It is the last task attempt for the task.
// 2. After the task receives T_ATTEMPT_FAILED, it will notify job.
// 3. Job will be marked failed.
// 4. As part of MRAppMaster's shutdown, all containers will be killed.
.addTransition(TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
new ExitFinishingOnContainerCleanedupTransition())
.addTransition(TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_TIMED_OUT, FINISHING_ON_TIMEOUT_TRANSITION)
.addTransition(TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// ignore-able events
.addTransition(TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT))
// Transitions from COMMIT_PENDING state
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.COMMIT_PENDING, TaskAttemptEventType.TA_UPDATE,
new StatusUpdater())
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.SUCCESS_FINISHING_CONTAINER,
TaskAttemptEventType.TA_DONE, SUCCEEDED_FINISHING_TRANSITION)
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_KILL,
CLEANUP_CONTAINER_TRANSITION)
// if container killed by AM shutting down
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_CONTAINER_CLEANED, new KilledTransition())
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.FAIL_FINISHING_CONTAINER,
TaskAttemptEventType.TA_FAILMSG, FAILED_FINISHING_TRANSITION)
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
CLEANUP_CONTAINER_TRANSITION)
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
FINALIZE_FAILED_TRANSITION)
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_TIMED_OUT, CLEANUP_CONTAINER_TRANSITION)
// AM is likely to receive duplicate TA_COMMIT_PENDINGs as the task attempt
// will re-send the commit message until it doesn't encounter any
// IOException and succeeds in delivering the commit message.
// Ignoring the duplicate commit message is a short-term fix. In long term,
// we need to make use of retry cache to help this and other MR protocol
// APIs that can be considered as @AtMostOnce.
.addTransition(TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptStateInternal.COMMIT_PENDING,
TaskAttemptEventType.TA_COMMIT_PENDING)
// Transitions from SUCCESS_CONTAINER_CLEANUP state
// kill and cleanup the container
.addTransition(TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptStateInternal.SUCCEEDED,
TaskAttemptEventType.TA_CONTAINER_CLEANED)
.addTransition(
TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events
.addTransition(TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
TaskAttemptStateInternal.SUCCESS_CONTAINER_CLEANUP,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_TIMED_OUT,
TaskAttemptEventType.TA_CONTAINER_COMPLETED))
// Transitions from FAIL_CONTAINER_CLEANUP state.
.addTransition(TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
TaskAttemptEventType.TA_CONTAINER_CLEANED, new TaskCleanupTransition())
.addTransition(TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events
.addTransition(TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.FAIL_CONTAINER_CLEANUP,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_COMMIT_PENDING,
// Container launch events can arrive late
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_TIMED_OUT))
// Transitions from KILL_CONTAINER_CLEANUP
.addTransition(TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.KILL_TASK_CLEANUP,
TaskAttemptEventType.TA_CONTAINER_CLEANED, new TaskCleanupTransition())
.addTransition(TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events
.addTransition(
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
TaskAttemptStateInternal.KILL_CONTAINER_CLEANUP,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_TIMED_OUT))
// Transitions from FAIL_TASK_CLEANUP
// run the task cleanup
.addTransition(TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
TaskAttemptStateInternal.FAILED, TaskAttemptEventType.TA_CLEANUP_DONE,
new FailedTransition())
.addTransition(TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events
.addTransition(TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
TaskAttemptStateInternal.FAIL_TASK_CLEANUP,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
// Container launch events can arrive late
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED))
// Transitions from KILL_TASK_CLEANUP
.addTransition(TaskAttemptStateInternal.KILL_TASK_CLEANUP,
TaskAttemptStateInternal.KILLED, TaskAttemptEventType.TA_CLEANUP_DONE,
new KilledTransition())
.addTransition(TaskAttemptStateInternal.KILL_TASK_CLEANUP,
TaskAttemptStateInternal.KILL_TASK_CLEANUP,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events
.addTransition(TaskAttemptStateInternal.KILL_TASK_CLEANUP,
TaskAttemptStateInternal.KILL_TASK_CLEANUP,
EnumSet.of(TaskAttemptEventType.TA_KILL,
TaskAttemptEventType.TA_CONTAINER_COMPLETED,
TaskAttemptEventType.TA_UPDATE,
TaskAttemptEventType.TA_COMMIT_PENDING,
TaskAttemptEventType.TA_DONE,
TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
TaskAttemptEventType.TA_PREEMPTED,
// Container launch events can arrive late
TaskAttemptEventType.TA_CONTAINER_LAUNCHED,
TaskAttemptEventType.TA_CONTAINER_LAUNCH_FAILED))
// Transitions from SUCCEEDED
.addTransition(TaskAttemptStateInternal.SUCCEEDED, //only possible for map attempts
TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_TOO_MANY_FETCH_FAILURE,
new TooManyFetchFailureTransition())
.addTransition(TaskAttemptStateInternal.SUCCEEDED,
EnumSet.of(TaskAttemptStateInternal.SUCCEEDED, TaskAttemptStateInternal.KILLED),
TaskAttemptEventType.TA_KILL,
new KilledAfterSuccessTransition())
.addTransition(
TaskAttemptStateInternal.SUCCEEDED, TaskAttemptStateInternal.SUCCEEDED,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events for SUCCEEDED state
.addTransition(TaskAttemptStateInternal.SUCCEEDED,
TaskAttemptStateInternal.SUCCEEDED,
EnumSet.of(TaskAttemptEventType.TA_FAILMSG,
TaskAttemptEventType.TA_FAILMSG_BY_CLIENT,
// TaskAttemptFinishingMonitor might time out the attempt right
// after the attempt receives TA_CONTAINER_COMPLETED.
TaskAttemptEventType.TA_TIMED_OUT,
TaskAttemptEventType.TA_CONTAINER_CLEANED,
TaskAttemptEventType.TA_CONTAINER_COMPLETED))
// Transitions from FAILED state
.addTransition(TaskAttemptStateInternal.FAILED, TaskAttemptStateInternal.FAILED,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events for FAILED state
.addTransition(TaskAttemptStateInternal.FAILED, TaskAttemptStateInternal.FAILED,
FAILED_KILLED_STATE_IGNORED_EVENTS)
// Transitions from KILLED state
.addTransition(TaskAttemptStateInternal.KILLED, TaskAttemptStateInternal.KILLED,
TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
DIAGNOSTIC_INFORMATION_UPDATE_TRANSITION)
// Ignore-able events for KILLED state
.addTransition(TaskAttemptStateInternal.KILLED, TaskAttemptStateInternal.KILLED,
FAILED_KILLED_STATE_IGNORED_EVENTS)
// create the topology tables
.installTopology();
private final StateMachine
<TaskAttemptStateInternal, TaskAttemptEventType, TaskAttemptEvent>
stateMachine;
@VisibleForTesting
public Container container;
private String nodeRackName;
private WrappedJvmID jvmID;
//this takes good amount of memory ~ 30KB. Instantiate it lazily
//and make it null once task is launched.
private org.apache.hadoop.mapred.Task remoteTask;
//this is the last status reported by the REMOTE running attempt
private TaskAttemptStatus reportedStatus;
private static final String LINE_SEPARATOR = System
.getProperty("line.separator");
public TaskAttemptImpl(TaskId taskId, int i,
EventHandler eventHandler,
TaskAttemptListener taskAttemptListener, Path jobFile, int partition,
JobConf conf, String[] dataLocalHosts,
Token<JobTokenIdentifier> jobToken,
Credentials credentials, Clock clock,
AppContext appContext) {
oldJobId = TypeConverter.fromYarn(taskId.getJobId());
this.conf = conf;
this.clock = clock;
attemptId = recordFactory.newRecordInstance(TaskAttemptId.class);
attemptId.setTaskId(taskId);
attemptId.setId(i);
this.taskAttemptListener = taskAttemptListener;
this.appContext = appContext;
// Initialize reportedStatus
reportedStatus = new TaskAttemptStatus();
initTaskAttemptStatus(reportedStatus);
ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
readLock = readWriteLock.readLock();
writeLock = readWriteLock.writeLock();
this.credentials = credentials;
this.jobToken = jobToken;
this.eventHandler = eventHandler;
this.jobFile = jobFile;
this.partition = partition;
//TODO:create the resource reqt for this Task attempt
this.resourceCapability = recordFactory.newRecordInstance(Resource.class);
this.resourceCapability.setMemorySize(
getMemoryRequired(conf, taskId.getTaskType()));
this.resourceCapability.setVirtualCores(
getCpuRequired(conf, taskId.getTaskType()));
this.dataLocalHosts = resolveHosts(dataLocalHosts);
RackResolver.init(conf);
this.dataLocalRacks = new HashSet<String>();
for (String host : this.dataLocalHosts) {
this.dataLocalRacks.add(RackResolver.resolve(host).getNetworkLocation());
}
locality = Locality.OFF_SWITCH;
avataar = Avataar.VIRGIN;
// This "this leak" is okay because the retained pointer is in an
// instance variable.
stateMachine = stateMachineFactory.make(this);
}
private int getMemoryRequired(JobConf conf, TaskType taskType) {
return conf.getMemoryRequired(TypeConverter.fromYarn(taskType));
}
private int getCpuRequired(Configuration conf, TaskType taskType) {
int vcores = 1;
if (taskType == TaskType.MAP) {
vcores =
conf.getInt(MRJobConfig.MAP_CPU_VCORES,
MRJobConfig.DEFAULT_MAP_CPU_VCORES);
} else if (taskType == TaskType.REDUCE) {
vcores =
conf.getInt(MRJobConfig.REDUCE_CPU_VCORES,
MRJobConfig.DEFAULT_REDUCE_CPU_VCORES);
}
return vcores;
}
/**
* Create a {@link LocalResource} record with all the given parameters.
*/
private static LocalResource createLocalResource(FileSystem fc, Path file,
LocalResourceType type, LocalResourceVisibility visibility)
throws IOException {
FileStatus fstat = fc.getFileStatus(file);
URL resourceURL = URL.fromPath(fc.resolvePath(fstat.getPath()));
long resourceSize = fstat.getLen();
long resourceModificationTime = fstat.getModificationTime();
return LocalResource.newInstance(resourceURL, type, visibility,
resourceSize, resourceModificationTime);
}
/**
* Lock this on initialClasspath so that there is only one fork in the AM for
* getting the initial class-path. TODO: We already construct
* a parent CLC and use it for all the containers, so this should go away
* once the mr-generated-classpath stuff is gone.
*/
private static String getInitialClasspath(Configuration conf) throws IOException {
synchronized (classpathLock) {
if (initialClasspathFlag.get()) {
return initialClasspath;
}
Map<String, String> env = new HashMap<String, String>();
MRApps.setClasspath(env, conf);
initialClasspath = env.get(Environment.CLASSPATH.name());
initialAppClasspath = env.get(Environment.APP_CLASSPATH.name());
initialClasspathFlag.set(true);
return initialClasspath;
}
}
/**
* Create the common {@link ContainerLaunchContext} for all attempts.
* @param applicationACLs
*/
private static ContainerLaunchContext createCommonContainerLaunchContext(
Map<ApplicationAccessType, String> applicationACLs, Configuration conf,
Token<JobTokenIdentifier> jobToken,
final org.apache.hadoop.mapred.JobID oldJobId,
Credentials credentials) {
// Application resources
Map<String, LocalResource> localResources =
new HashMap<String, LocalResource>();
// Application environment
Map<String, String> environment = new HashMap<String, String>();
// Service data
Map<String, ByteBuffer> serviceData = new HashMap<String, ByteBuffer>();
// Tokens
ByteBuffer taskCredentialsBuffer = ByteBuffer.wrap(new byte[]{});
try {
FileSystem remoteFS = FileSystem.get(conf);
// //////////// Set up JobJar to be localized properly on the remote NM.
String jobJar = conf.get(MRJobConfig.JAR);
if (jobJar != null) {
final Path jobJarPath = new Path(jobJar);
final FileSystem jobJarFs = FileSystem.get(jobJarPath.toUri(), conf);
Path remoteJobJar = jobJarPath.makeQualified(jobJarFs.getUri(),
jobJarFs.getWorkingDirectory());
LocalResource rc = createLocalResource(jobJarFs, remoteJobJar,
LocalResourceType.PATTERN, LocalResourceVisibility.APPLICATION);
String pattern = conf.getPattern(JobContext.JAR_UNPACK_PATTERN,
JobConf.UNPACK_JAR_PATTERN_DEFAULT).pattern();
rc.setPattern(pattern);
localResources.put(MRJobConfig.JOB_JAR, rc);
LOG.info("The job-jar file on the remote FS is "
+ remoteJobJar.toUri().toASCIIString());
} else {
// Job jar may be null. For e.g, for pipes, the job jar is the hadoop
// mapreduce jar itself which is already on the classpath.
LOG.info("Job jar is not present. "
+ "Not adding any jar to the list of resources.");
}
// //////////// End of JobJar setup
// //////////// Set up JobConf to be localized properly on the remote NM.
Path path =
MRApps.getStagingAreaDir(conf, UserGroupInformation
.getCurrentUser().getShortUserName());
Path remoteJobSubmitDir =
new Path(path, oldJobId.toString());
Path remoteJobConfPath =
new Path(remoteJobSubmitDir, MRJobConfig.JOB_CONF_FILE);
localResources.put(
MRJobConfig.JOB_CONF_FILE,
createLocalResource(remoteFS, remoteJobConfPath,
LocalResourceType.FILE, LocalResourceVisibility.APPLICATION));
LOG.info("The job-conf file on the remote FS is "
+ remoteJobConfPath.toUri().toASCIIString());
// //////////// End of JobConf setup
// Setup DistributedCache
MRApps.setupDistributedCache(conf, localResources);
// Setup up task credentials buffer
LOG.info("Adding #" + credentials.numberOfTokens()
+ " tokens and #" + credentials.numberOfSecretKeys()
+ " secret keys for NM use for launching container");
Credentials taskCredentials = new Credentials(credentials);
// LocalStorageToken is needed irrespective of whether security is enabled
// or not.
TokenCache.setJobToken(jobToken, taskCredentials);
DataOutputBuffer containerTokens_dob = new DataOutputBuffer();
LOG.info("Size of containertokens_dob is "
+ taskCredentials.numberOfTokens());
taskCredentials.writeTokenStorageToStream(containerTokens_dob);
taskCredentialsBuffer =
ByteBuffer.wrap(containerTokens_dob.getData(), 0,
containerTokens_dob.getLength());
// Add shuffle secret key
// The secret key is converted to a JobToken to preserve backwards
// compatibility with an older ShuffleHandler running on an NM.
LOG.info("Putting shuffle token in serviceData");
byte[] shuffleSecret = TokenCache.getShuffleSecretKey(credentials);
if (shuffleSecret == null) {
LOG.warn("Cannot locate shuffle secret in credentials."
+ " Using job token as shuffle secret.");
shuffleSecret = jobToken.getPassword();
}
Token<JobTokenIdentifier> shuffleToken = new Token<JobTokenIdentifier>(
jobToken.getIdentifier(), shuffleSecret, jobToken.getKind(),
jobToken.getService());
serviceData.put(ShuffleHandler.MAPREDUCE_SHUFFLE_SERVICEID,
ShuffleHandler.serializeServiceData(shuffleToken));
// add external shuffle-providers - if any
Collection<String> shuffleProviders = conf.getStringCollection(
MRJobConfig.MAPREDUCE_JOB_SHUFFLE_PROVIDER_SERVICES);
if (! shuffleProviders.isEmpty()) {
Collection<String> auxNames = conf.getStringCollection(
YarnConfiguration.NM_AUX_SERVICES);
for (final String shuffleProvider : shuffleProviders) {
if (shuffleProvider.equals(ShuffleHandler.MAPREDUCE_SHUFFLE_SERVICEID)) {
continue; // skip built-in shuffle-provider that was already inserted with shuffle secret key
}
if (auxNames.contains(shuffleProvider)) {
LOG.info("Adding ShuffleProvider Service: " + shuffleProvider + " to serviceData");
// This only serves for INIT_APP notifications
// The shuffle service needs to be able to work with the host:port information provided by the AM
// (i.e. shuffle services which require custom location / other configuration are not supported)
serviceData.put(shuffleProvider, ByteBuffer.allocate(0));
}
else {
throw new YarnRuntimeException("ShuffleProvider Service: " + shuffleProvider +
" was NOT found in the list of aux-services that are available in this NM." +
" You may need to specify this ShuffleProvider as an aux-service in your yarn-site.xml");
}
}
}
MRApps.addToEnvironment(
environment,
Environment.CLASSPATH.name(),
getInitialClasspath(conf), conf);
if (initialAppClasspath != null) {
MRApps.addToEnvironment(
environment,
Environment.APP_CLASSPATH.name(),
initialAppClasspath, conf);
}
} catch (IOException e) {
throw new YarnRuntimeException(e);
}
// Shell
environment.put(
Environment.SHELL.name(),
conf.get(
MRJobConfig.MAPRED_ADMIN_USER_SHELL,
MRJobConfig.DEFAULT_SHELL)
);
// Add pwd to LD_LIBRARY_PATH, add this before adding anything else
MRApps.addToEnvironment(
environment,
Environment.LD_LIBRARY_PATH.name(),
MRApps.crossPlatformifyMREnv(conf, Environment.PWD), conf);
// Add the env variables passed by the admin
MRApps.setEnvFromInputString(
environment,
conf.get(
MRJobConfig.MAPRED_ADMIN_USER_ENV,
MRJobConfig.DEFAULT_MAPRED_ADMIN_USER_ENV), conf
);
// Construct the actual Container
// The null fields are per-container and will be constructed for each
// container separately.
ContainerLaunchContext container =
ContainerLaunchContext.newInstance(localResources, environment, null,
serviceData, taskCredentialsBuffer, applicationACLs);
return container;
}
static ContainerLaunchContext createContainerLaunchContext(
Map<ApplicationAccessType, String> applicationACLs,
Configuration conf, Token<JobTokenIdentifier> jobToken, Task remoteTask,
final org.apache.hadoop.mapred.JobID oldJobId,
WrappedJvmID jvmID,
TaskAttemptListener taskAttemptListener,
Credentials credentials) {
synchronized (commonContainerSpecLock) {
if (commonContainerSpec == null) {
commonContainerSpec = createCommonContainerLaunchContext(
applicationACLs, conf, jobToken, oldJobId, credentials);
}
}
// Fill in the fields needed per-container that are missing in the common
// spec.
boolean userClassesTakesPrecedence =
conf.getBoolean(MRJobConfig.MAPREDUCE_JOB_USER_CLASSPATH_FIRST, false);
// Setup environment by cloning from common env.
Map<String, String> env = commonContainerSpec.getEnvironment();
Map<String, String> myEnv = new HashMap<String, String>(env.size());
myEnv.putAll(env);
if (userClassesTakesPrecedence) {
myEnv.put(Environment.CLASSPATH_PREPEND_DISTCACHE.name(), "true");
}
MapReduceChildJVM.setVMEnv(myEnv, remoteTask);
// Set up the launch command
List<String> commands = MapReduceChildJVM.getVMCommand(
taskAttemptListener.getAddress(), remoteTask, jvmID);
// Duplicate the ByteBuffers for access by multiple containers.
Map<String, ByteBuffer> myServiceData = new HashMap<String, ByteBuffer>();
for (Entry<String, ByteBuffer> entry : commonContainerSpec
.getServiceData().entrySet()) {
myServiceData.put(entry.getKey(), entry.getValue().duplicate());
}
// Construct the actual Container
ContainerLaunchContext container = ContainerLaunchContext.newInstance(
commonContainerSpec.getLocalResources(), myEnv, commands,
myServiceData, commonContainerSpec.getTokens().duplicate(),
applicationACLs);
return container;
}
@Override
public ContainerId getAssignedContainerID() {
readLock.lock();
try {
return container == null ? null : container.getId();
} finally {
readLock.unlock();
}
}
@Override
public String getAssignedContainerMgrAddress() {
readLock.lock();
try {
return container == null ? null : StringInterner.weakIntern(container
.getNodeId().toString());
} finally {
readLock.unlock();
}
}
@Override
public long getLaunchTime() {
readLock.lock();
try {
return launchTime;
} finally {
readLock.unlock();
}
}
@Override
public long getFinishTime() {
readLock.lock();