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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-7028) Concurrent task progress updates causing NPE in Application Master
Date Wed, 03 Jan 2018 00:08:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308905#comment-16308905
] 

Miklos Szegedi commented on MAPREDUCE-7028:
-------------------------------------------

Thank you for the patch [~grepas]. I do not see any more issues with patch 004. [~jlowe],
what do you think?

> Concurrent task progress updates causing NPE in Application Master
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7028
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7028
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am
>    Affects Versions: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
>            Reporter: Gergo Repas
>            Assignee: Gergo Repas
>         Attachments: MAPREDUCE-7028.000.patch, MAPREDUCE-7028.001.patch, MAPREDUCE-7028.002.patch,
MAPREDUCE-7028.003.patch, MAPREDUCE-7028.004.patch
>
>
> Concurrent task progress updates can cause a NullPointerException in the Application
Master (stack trace is with code at current trunk):
> {quote}
> 2017-12-20 06:49:42,369 INFO [IPC Server handler 9 on 39501] org.apache.hadoop.mapred.TaskAttemptListenerImpl:
Progress of TaskAttempt attempt_1513780867907_0001_m_000002_0 is : 0.02677883
> 2017-12-20 06:49:42,369 INFO [IPC Server handler 13 on 39501] org.apache.hadoop.mapred.TaskAttemptListenerImpl:
Progress of TaskAttempt attempt_1513780867907_0001_m_000002_0 is : 0.02677883
> 2017-12-20 06:49:42,383 FATAL [AsyncDispatcher event handler] org.apache.hadoop.yarn.event.AsyncDispatcher:
Error in dispatcher thread
> java.lang.NullPointerException
>         at org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl$StatusUpdater.transition(TaskAttemptImpl.java:2450)
>         at org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl$StatusUpdater.transition(TaskAttemptImpl.java:2433)
>         at org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
>         at org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
>         at org.apache.hadoop.yarn.state.StateMachineFactory.access$500(StateMachineFactory.java:46)
>         at org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:487)
>         at org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl.handle(TaskAttemptImpl.java:1362)
>         at org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl.handle(TaskAttemptImpl.java:154)
>         at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskAttemptEventDispatcher.handle(MRAppMaster.java:1543)
>         at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$TaskAttemptEventDispatcher.handle(MRAppMaster.java:1535)
>         at org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:197)
>         at org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:126)
>         at java.lang.Thread.run(Thread.java:748)
> 2017-12-20 06:49:42,385 INFO [IPC Server handler 13 on 39501] org.apache.hadoop.mapred.TaskAttemptListenerImpl:
Progress of TaskAttempt attempt_1513780867907_0001_m_000002_0 is : 0.02677883
> 2017-12-20 06:49:42,386 INFO [AsyncDispatcher ShutDown handler] org.apache.hadoop.yarn.event.AsyncDispatcher:
Exiting, bbye..
> {quote}
> This happened naturally in several big wordcount runs, and I could reproduce this reliably
by artificially making task updates more frequent.



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