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https://issues.apache.org/jira/browse/MAPREDUCE-6815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713561#comment-15713561
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Haibo Chen commented on MAPREDUCE-6815:
---------------------------------------

bq.
2016-11-23 10:08:07,726 ERROR [AsyncDispatcher event handler] impl.TaskImpl 
(TaskImpl.java:handle(656)) - Can't handle this event at current state for 
task_0_0000_m_000000
org.apache.hadoop.yarn.state.InvalidStateTransitionException: Invalid event: 
T_SCHEDULE at KILLED
        at 
org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:305)
        at 
org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
        at 
org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
        at 
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskImpl.handle(TaskImpl.java:654)
        at 
org.apache.hadoop.mapreduce.v2.app.job.impl.TaskImpl.handle(TaskImpl.java:101)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskEventDispatcher.handle(MRAppMaster.java:1475)
        at 
org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskEventDispatcher.handle(MRAppMaster.java:1469)
        at 
org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:187)
        at 
org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:113)
        at java.lang.Thread.run(Thread.java:745)

On the other hand, A T_SCHEDULE event on a killed task is invalid, and will 
cause the job to fail as well. We could add a new transition from killed to 
killed state upon a T_SCHEDULE event (basically ignoring it )

> Fix flaky TestKill.testKillTask()
> ---------------------------------
>
>                 Key: MAPREDUCE-6815
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6815
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>
> Error Message
> Job state is not correct (timedout) expected:<SUCCEEDED> but was:<ERROR>
> Stacktrace
> java.lang.AssertionError: Job state is not correct (timedout) 
> expected:<SUCCEEDED> but was:<ERROR>
> at org.junit.Assert.fail(Assert.java:88)
> at org.junit.Assert.failNotEquals(Assert.java:743)
> at org.junit.Assert.assertEquals(Assert.java:118)
> at org.apache.hadoop.mapreduce.v2.app.MRApp.waitForState(MRApp.java:416)
> at org.apache.hadoop.mapreduce.v2.app.TestKill.testKillTask(TestKill.java:124)



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