MAPREDUCE-4607. Race condition in ReduceTask completion can result in Task being incorrectly failed. Contributed by Bikas Saha.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1383422 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Thomas White
parent
bdcbc2d1ef
commit
3b46295c28
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@ -71,6 +71,7 @@ import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
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import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptReport;
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import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptState;
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import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
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import org.apache.hadoop.mapreduce.v2.api.records.TaskState;
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import org.apache.hadoop.mapreduce.v2.api.records.TaskType;
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import org.apache.hadoop.mapreduce.v2.app.AppContext;
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import org.apache.hadoop.mapreduce.v2.app.TaskAttemptListener;
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@ -86,6 +87,7 @@ import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEvent;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEventType;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptKillEvent;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskEvent;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent.TaskAttemptStatus;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskEventType;
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import org.apache.hadoop.mapreduce.v2.app.job.event.TaskTAttemptEvent;
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@ -120,6 +122,7 @@ import org.apache.hadoop.yarn.event.EventHandler;
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import org.apache.hadoop.yarn.factories.RecordFactory;
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import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
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import org.apache.hadoop.yarn.state.InvalidStateTransitonException;
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import org.apache.hadoop.yarn.state.MultipleArcTransition;
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import org.apache.hadoop.yarn.state.SingleArcTransition;
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import org.apache.hadoop.yarn.state.StateMachine;
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import org.apache.hadoop.yarn.state.StateMachineFactory;
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@ -128,6 +131,8 @@ import org.apache.hadoop.yarn.util.BuilderUtils;
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import org.apache.hadoop.yarn.util.ConverterUtils;
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import org.apache.hadoop.yarn.util.RackResolver;
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import com.google.common.base.Preconditions;
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/**
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* Implementation of TaskAttempt interface.
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*/
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@ -404,10 +409,10 @@ public abstract class TaskAttemptImpl implements
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TaskAttemptState.FAILED,
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TaskAttemptEventType.TA_TOO_MANY_FETCH_FAILURE,
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new TooManyFetchFailureTransition())
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.addTransition(
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TaskAttemptState.SUCCEEDED, TaskAttemptState.KILLED,
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TaskAttemptEventType.TA_KILL,
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new KilledAfterSuccessTransition())
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.addTransition(TaskAttemptState.SUCCEEDED,
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EnumSet.of(TaskAttemptState.SUCCEEDED, TaskAttemptState.KILLED),
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TaskAttemptEventType.TA_KILL,
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new KilledAfterSuccessTransition())
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.addTransition(
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TaskAttemptState.SUCCEEDED, TaskAttemptState.SUCCEEDED,
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TaskAttemptEventType.TA_DIAGNOSTICS_UPDATE,
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@ -1483,6 +1488,9 @@ public abstract class TaskAttemptImpl implements
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@SuppressWarnings("unchecked")
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@Override
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public void transition(TaskAttemptImpl taskAttempt, TaskAttemptEvent event) {
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// too many fetch failure can only happen for map tasks
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Preconditions
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.checkArgument(taskAttempt.getID().getTaskId().getTaskType() == TaskType.MAP);
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//add to diagnostic
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taskAttempt.addDiagnosticInfo("Too Many fetch failures.Failing the attempt");
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//set the finish time
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@ -1506,15 +1514,30 @@ public abstract class TaskAttemptImpl implements
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}
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private static class KilledAfterSuccessTransition implements
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SingleArcTransition<TaskAttemptImpl, TaskAttemptEvent> {
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MultipleArcTransition<TaskAttemptImpl, TaskAttemptEvent, TaskAttemptState> {
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@SuppressWarnings("unchecked")
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@Override
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public void transition(TaskAttemptImpl taskAttempt,
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public TaskAttemptState transition(TaskAttemptImpl taskAttempt,
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TaskAttemptEvent event) {
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TaskAttemptKillEvent msgEvent = (TaskAttemptKillEvent) event;
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//add to diagnostic
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taskAttempt.addDiagnosticInfo(msgEvent.getMessage());
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if(taskAttempt.getID().getTaskId().getTaskType() == TaskType.REDUCE) {
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// after a reduce task has succeeded, its outputs are in safe in HDFS.
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// logically such a task should not be killed. we only come here when
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// there is a race condition in the event queue. E.g. some logic sends
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// a kill request to this attempt when the successful completion event
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// for this task is already in the event queue. so the kill event will
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// get executed immediately after the attempt is marked successful and
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// result in this transition being exercised.
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// ignore this for reduce tasks
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LOG.info("Ignoring killed event for successful reduce task attempt" +
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taskAttempt.getID().toString());
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return TaskAttemptState.SUCCEEDED;
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}
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if(event instanceof TaskAttemptKillEvent) {
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TaskAttemptKillEvent msgEvent = (TaskAttemptKillEvent) event;
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//add to diagnostic
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taskAttempt.addDiagnosticInfo(msgEvent.getMessage());
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}
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// not setting a finish time since it was set on success
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assert (taskAttempt.getFinishTime() != 0);
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@ -1528,6 +1551,7 @@ public abstract class TaskAttemptImpl implements
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.getTaskId().getJobId(), tauce));
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taskAttempt.eventHandler.handle(new TaskTAttemptEvent(
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taskAttempt.attemptId, TaskEventType.T_ATTEMPT_KILLED));
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return TaskAttemptState.KILLED;
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}
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}
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@ -191,12 +191,12 @@ public abstract class TaskImpl implements Task, EventHandler<TaskEvent> {
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TaskEventType.T_ADD_SPEC_ATTEMPT))
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// Transitions from SUCCEEDED state
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.addTransition(TaskState.SUCCEEDED, //only possible for map tasks
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.addTransition(TaskState.SUCCEEDED,
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EnumSet.of(TaskState.SCHEDULED, TaskState.SUCCEEDED, TaskState.FAILED),
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TaskEventType.T_ATTEMPT_FAILED, new MapRetroactiveFailureTransition())
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.addTransition(TaskState.SUCCEEDED, //only possible for map tasks
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TaskEventType.T_ATTEMPT_FAILED, new RetroactiveFailureTransition())
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.addTransition(TaskState.SUCCEEDED,
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EnumSet.of(TaskState.SCHEDULED, TaskState.SUCCEEDED),
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TaskEventType.T_ATTEMPT_KILLED, new MapRetroactiveKilledTransition())
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TaskEventType.T_ATTEMPT_KILLED, new RetroactiveKilledTransition())
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// Ignore-able transitions.
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.addTransition(
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TaskState.SUCCEEDED, TaskState.SUCCEEDED,
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@ -897,7 +897,7 @@ public abstract class TaskImpl implements Task, EventHandler<TaskEvent> {
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}
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}
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private static class MapRetroactiveFailureTransition
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private static class RetroactiveFailureTransition
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extends AttemptFailedTransition {
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@Override
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@ -912,7 +912,7 @@ public abstract class TaskImpl implements Task, EventHandler<TaskEvent> {
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}
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}
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//verify that this occurs only for map task
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// a successful REDUCE task should not be overridden
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//TODO: consider moving it to MapTaskImpl
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if (!TaskType.MAP.equals(task.getType())) {
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LOG.error("Unexpected event for REDUCE task " + event.getType());
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@ -938,42 +938,46 @@ public abstract class TaskImpl implements Task, EventHandler<TaskEvent> {
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}
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}
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private static class MapRetroactiveKilledTransition implements
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private static class RetroactiveKilledTransition implements
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MultipleArcTransition<TaskImpl, TaskEvent, TaskState> {
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@Override
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public TaskState transition(TaskImpl task, TaskEvent event) {
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// verify that this occurs only for map task
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TaskAttemptId attemptId = null;
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if (event instanceof TaskTAttemptEvent) {
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TaskTAttemptEvent castEvent = (TaskTAttemptEvent) event;
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attemptId = castEvent.getTaskAttemptID();
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if (task.getState() == TaskState.SUCCEEDED &&
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!attemptId.equals(task.successfulAttempt)) {
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// don't allow a different task attempt to override a previous
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// succeeded state
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return TaskState.SUCCEEDED;
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}
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}
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// a successful REDUCE task should not be overridden
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// TODO: consider moving it to MapTaskImpl
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if (!TaskType.MAP.equals(task.getType())) {
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LOG.error("Unexpected event for REDUCE task " + event.getType());
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task.internalError(event.getType());
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}
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TaskTAttemptEvent attemptEvent = (TaskTAttemptEvent) event;
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TaskAttemptId attemptId = attemptEvent.getTaskAttemptID();
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if(task.successfulAttempt == attemptId) {
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// successful attempt is now killed. reschedule
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// tell the job about the rescheduling
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unSucceed(task);
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task.handleTaskAttemptCompletion(
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attemptId,
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TaskAttemptCompletionEventStatus.KILLED);
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task.eventHandler.handle(new JobMapTaskRescheduledEvent(task.taskId));
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// typically we are here because this map task was run on a bad node and
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// we want to reschedule it on a different node.
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// Depending on whether there are previous failed attempts or not this
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// can SCHEDULE or RESCHEDULE the container allocate request. If this
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// SCHEDULE's then the dataLocal hosts of this taskAttempt will be used
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// from the map splitInfo. So the bad node might be sent as a location
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// to the RM. But the RM would ignore that just like it would ignore
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// currently pending container requests affinitized to bad nodes.
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task.addAndScheduleAttempt();
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return TaskState.SCHEDULED;
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} else {
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// nothing to do
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return TaskState.SUCCEEDED;
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}
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// successful attempt is now killed. reschedule
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// tell the job about the rescheduling
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unSucceed(task);
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task.handleTaskAttemptCompletion(attemptId,
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TaskAttemptCompletionEventStatus.KILLED);
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task.eventHandler.handle(new JobMapTaskRescheduledEvent(task.taskId));
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// typically we are here because this map task was run on a bad node and
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// we want to reschedule it on a different node.
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// Depending on whether there are previous failed attempts or not this
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// can SCHEDULE or RESCHEDULE the container allocate request. If this
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// SCHEDULE's then the dataLocal hosts of this taskAttempt will be used
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// from the map splitInfo. So the bad node might be sent as a location
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// to the RM. But the RM would ignore that just like it would ignore
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// currently pending container requests affinitized to bad nodes.
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task.addAndScheduleAttempt();
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return TaskState.SCHEDULED;
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}
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}
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@ -180,7 +180,7 @@ public class TestMRApp {
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@Test
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public void testUpdatedNodes() throws Exception {
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int runCount = 0;
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MRApp app = new MRAppWithHistory(2, 1, false, this.getClass().getName(),
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MRApp app = new MRAppWithHistory(2, 2, false, this.getClass().getName(),
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true, ++runCount);
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Configuration conf = new Configuration();
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// after half of the map completion, reduce will start
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@ -189,7 +189,7 @@ public class TestMRApp {
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conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
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Job job = app.submit(conf);
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app.waitForState(job, JobState.RUNNING);
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Assert.assertEquals("Num tasks not correct", 3, job.getTasks().size());
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Assert.assertEquals("Num tasks not correct", 4, job.getTasks().size());
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Iterator<Task> it = job.getTasks().values().iterator();
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Task mapTask1 = it.next();
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Task mapTask2 = it.next();
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@ -272,18 +272,19 @@ public class TestMRApp {
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// rerun
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// in rerun the 1st map will be recovered from previous run
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app = new MRAppWithHistory(2, 1, false, this.getClass().getName(), false,
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app = new MRAppWithHistory(2, 2, false, this.getClass().getName(), false,
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++runCount);
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conf = new Configuration();
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conf.setBoolean(MRJobConfig.MR_AM_JOB_RECOVERY_ENABLE, true);
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conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
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job = app.submit(conf);
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app.waitForState(job, JobState.RUNNING);
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Assert.assertEquals("No of tasks not correct", 3, job.getTasks().size());
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Assert.assertEquals("No of tasks not correct", 4, job.getTasks().size());
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it = job.getTasks().values().iterator();
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mapTask1 = it.next();
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mapTask2 = it.next();
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Task reduceTask = it.next();
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Task reduceTask1 = it.next();
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Task reduceTask2 = it.next();
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// map 1 will be recovered, no need to send done
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app.waitForState(mapTask1, TaskState.SUCCEEDED);
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@ -306,19 +307,36 @@ public class TestMRApp {
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Assert.assertEquals("Expecting 1 more completion events for success", 3,
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events.length);
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app.waitForState(reduceTask, TaskState.RUNNING);
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TaskAttempt task3Attempt = reduceTask.getAttempts().values().iterator()
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app.waitForState(reduceTask1, TaskState.RUNNING);
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app.waitForState(reduceTask2, TaskState.RUNNING);
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TaskAttempt task3Attempt = reduceTask1.getAttempts().values().iterator()
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.next();
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app.getContext()
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.getEventHandler()
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.handle(
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new TaskAttemptEvent(task3Attempt.getID(),
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TaskAttemptEventType.TA_DONE));
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app.waitForState(reduceTask, TaskState.SUCCEEDED);
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app.waitForState(reduceTask1, TaskState.SUCCEEDED);
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app.getContext()
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.getEventHandler()
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.handle(
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new TaskAttemptEvent(task3Attempt.getID(),
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TaskAttemptEventType.TA_KILL));
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app.waitForState(reduceTask1, TaskState.SUCCEEDED);
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TaskAttempt task4Attempt = reduceTask2.getAttempts().values().iterator()
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.next();
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app.getContext()
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.getEventHandler()
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.handle(
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new TaskAttemptEvent(task4Attempt.getID(),
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TaskAttemptEventType.TA_DONE));
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app.waitForState(reduceTask2, TaskState.SUCCEEDED);
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events = job.getTaskAttemptCompletionEvents(0, 100);
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Assert.assertEquals("Expecting 1 more completion events for success", 4,
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events.length);
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Assert.assertEquals("Expecting 2 more completion events for reduce success",
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5, events.length);
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// job succeeds
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app.waitForState(job, JobState.SUCCEEDED);
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@ -84,7 +84,6 @@ public class TestTaskImpl {
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private ApplicationId appId;
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private TaskSplitMetaInfo taskSplitMetaInfo;
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private String[] dataLocations = new String[0];
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private final TaskType taskType = TaskType.MAP;
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private AppContext appContext;
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private int startCount = 0;
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@ -97,6 +96,7 @@ public class TestTaskImpl {
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private class MockTaskImpl extends TaskImpl {
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private int taskAttemptCounter = 0;
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TaskType taskType;
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public MockTaskImpl(JobId jobId, int partition,
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EventHandler eventHandler, Path remoteJobConfFile, JobConf conf,
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@ -104,11 +104,12 @@ public class TestTaskImpl {
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Token<JobTokenIdentifier> jobToken,
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Credentials credentials, Clock clock,
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Map<TaskId, TaskInfo> completedTasksFromPreviousRun, int startCount,
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MRAppMetrics metrics, AppContext appContext) {
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MRAppMetrics metrics, AppContext appContext, TaskType taskType) {
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super(jobId, taskType , partition, eventHandler,
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remoteJobConfFile, conf, taskAttemptListener, committer,
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jobToken, credentials, clock,
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completedTasksFromPreviousRun, startCount, metrics, appContext);
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this.taskType = taskType;
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}
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@Override
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@ -120,7 +121,7 @@ public class TestTaskImpl {
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protected TaskAttemptImpl createAttempt() {
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MockTaskAttemptImpl attempt = new MockTaskAttemptImpl(getID(), ++taskAttemptCounter,
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eventHandler, taskAttemptListener, remoteJobConfFile, partition,
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conf, committer, jobToken, credentials, clock, appContext);
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conf, committer, jobToken, credentials, clock, appContext, taskType);
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taskAttempts.add(attempt);
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return attempt;
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}
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@ -142,18 +143,20 @@ public class TestTaskImpl {
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private float progress = 0;
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private TaskAttemptState state = TaskAttemptState.NEW;
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private TaskAttemptId attemptId;
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private TaskType taskType;
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public MockTaskAttemptImpl(TaskId taskId, int id, EventHandler eventHandler,
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TaskAttemptListener taskAttemptListener, Path jobFile, int partition,
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JobConf conf, OutputCommitter committer,
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Token<JobTokenIdentifier> jobToken,
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Credentials credentials, Clock clock,
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AppContext appContext) {
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AppContext appContext, TaskType taskType) {
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super(taskId, id, eventHandler, taskAttemptListener, jobFile, partition, conf,
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dataLocations, committer, jobToken, credentials, clock, appContext);
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attemptId = Records.newRecord(TaskAttemptId.class);
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attemptId.setId(id);
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attemptId.setTaskId(taskId);
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this.taskType = taskType;
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}
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public TaskAttemptId getAttemptId() {
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@ -162,7 +165,7 @@ public class TestTaskImpl {
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@Override
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protected Task createRemoteTask() {
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return new MockTask();
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return new MockTask(taskType);
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}
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public float getProgress() {
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@ -185,6 +188,11 @@ public class TestTaskImpl {
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private class MockTask extends Task {
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private TaskType taskType;
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MockTask(TaskType taskType) {
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this.taskType = taskType;
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}
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@Override
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public void run(JobConf job, TaskUmbilicalProtocol umbilical)
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throws IOException, ClassNotFoundException, InterruptedException {
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@ -193,7 +201,7 @@ public class TestTaskImpl {
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@Override
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public boolean isMapTask() {
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return true;
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return (taskType == TaskType.MAP);
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}
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}
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@ -228,13 +236,14 @@ public class TestTaskImpl {
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when(taskSplitMetaInfo.getLocations()).thenReturn(dataLocations);
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taskAttempts = new ArrayList<MockTaskAttemptImpl>();
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}
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mockTask = new MockTaskImpl(jobId, partition, dispatcher.getEventHandler(),
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private MockTaskImpl createMockTask(TaskType taskType) {
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return new MockTaskImpl(jobId, partition, dispatcher.getEventHandler(),
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remoteJobConfFile, conf, taskAttemptListener, committer, jobToken,
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credentials, clock,
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completedTasksFromPreviousRun, startCount,
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metrics, appContext);
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metrics, appContext, taskType);
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}
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@After
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@ -342,6 +351,7 @@ public class TestTaskImpl {
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@Test
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public void testInit() {
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LOG.info("--- START: testInit ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
assertTaskNewState();
|
||||
assert(taskAttempts.size() == 0);
|
||||
}
|
||||
|
|
@ -352,6 +362,7 @@ public class TestTaskImpl {
|
|||
*/
|
||||
public void testScheduleTask() {
|
||||
LOG.info("--- START: testScheduleTask ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
}
|
||||
|
|
@ -362,6 +373,7 @@ public class TestTaskImpl {
|
|||
*/
|
||||
public void testKillScheduledTask() {
|
||||
LOG.info("--- START: testKillScheduledTask ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
killTask(taskId);
|
||||
|
|
@ -374,6 +386,7 @@ public class TestTaskImpl {
|
|||
*/
|
||||
public void testKillScheduledTaskAttempt() {
|
||||
LOG.info("--- START: testKillScheduledTaskAttempt ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
killScheduledTaskAttempt(getLastAttempt().getAttemptId());
|
||||
|
|
@ -386,6 +399,7 @@ public class TestTaskImpl {
|
|||
*/
|
||||
public void testLaunchTaskAttempt() {
|
||||
LOG.info("--- START: testLaunchTaskAttempt ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
launchTaskAttempt(getLastAttempt().getAttemptId());
|
||||
|
|
@ -398,6 +412,7 @@ public class TestTaskImpl {
|
|||
*/
|
||||
public void testKillRunningTaskAttempt() {
|
||||
LOG.info("--- START: testKillRunningTaskAttempt ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
launchTaskAttempt(getLastAttempt().getAttemptId());
|
||||
|
|
@ -407,6 +422,7 @@ public class TestTaskImpl {
|
|||
@Test
|
||||
public void testTaskProgress() {
|
||||
LOG.info("--- START: testTaskProgress ---");
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
|
||||
// launch task
|
||||
TaskId taskId = getNewTaskID();
|
||||
|
|
@ -444,6 +460,7 @@ public class TestTaskImpl {
|
|||
|
||||
@Test
|
||||
public void testFailureDuringTaskAttemptCommit() {
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
launchTaskAttempt(getLastAttempt().getAttemptId());
|
||||
|
|
@ -469,8 +486,7 @@ public class TestTaskImpl {
|
|||
assertTaskSucceededState();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testSpeculativeTaskAttemptSucceedsEvenIfFirstFails() {
|
||||
private void runSpeculativeTaskAttemptSucceedsEvenIfFirstFails(TaskEventType failEvent) {
|
||||
TaskId taskId = getNewTaskID();
|
||||
scheduleTaskAttempt(taskId);
|
||||
launchTaskAttempt(getLastAttempt().getAttemptId());
|
||||
|
|
@ -489,11 +505,34 @@ public class TestTaskImpl {
|
|||
|
||||
// Now fail the first task attempt, after the second has succeeded
|
||||
mockTask.handle(new TaskTAttemptEvent(taskAttempts.get(0).getAttemptId(),
|
||||
TaskEventType.T_ATTEMPT_FAILED));
|
||||
failEvent));
|
||||
|
||||
// The task should still be in the succeeded state
|
||||
assertTaskSucceededState();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testMapSpeculativeTaskAttemptSucceedsEvenIfFirstFails() {
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
runSpeculativeTaskAttemptSucceedsEvenIfFirstFails(TaskEventType.T_ATTEMPT_FAILED);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReduceSpeculativeTaskAttemptSucceedsEvenIfFirstFails() {
|
||||
mockTask = createMockTask(TaskType.REDUCE);
|
||||
runSpeculativeTaskAttemptSucceedsEvenIfFirstFails(TaskEventType.T_ATTEMPT_FAILED);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testMapSpeculativeTaskAttemptSucceedsEvenIfFirstIsKilled() {
|
||||
mockTask = createMockTask(TaskType.MAP);
|
||||
runSpeculativeTaskAttemptSucceedsEvenIfFirstFails(TaskEventType.T_ATTEMPT_KILLED);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReduceSpeculativeTaskAttemptSucceedsEvenIfFirstIsKilled() {
|
||||
mockTask = createMockTask(TaskType.REDUCE);
|
||||
runSpeculativeTaskAttemptSucceedsEvenIfFirstFails(TaskEventType.T_ATTEMPT_KILLED);
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue