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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-7053) Timed out tasks can fail to produce thread dump
Date Wed, 14 Feb 2018 17:33:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364484#comment-16364484

Jason Lowe commented on MAPREDUCE-7053:

This is triggered by MAPREDUCE-5124.  Before MAPREDUCE-5124 tasks that were unknown were not
rejected.  After MAPREDUCE-5124 the AM started proactively rejecting unknown tasks and exposed
this latent issue.

> Timed out tasks can fail to produce thread dump
> -----------------------------------------------
>                 Key: MAPREDUCE-7053
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7053
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 3.1.0, 3.0.1, 2.10.0, 2.9.1, 2.8.4, 2.7.6
>            Reporter: Jason Lowe
>            Priority: Major
> TestMRJobs#testThreadDumpOnTaskTimeout has been failing sporadically recently.  When
the AM times out a task it immediately removes it from the list of known tasks and then connects
to the NM to request a thread dump followed by a kill.  If the task heartbeats in after the
task has been removed from the list of known tasks but before the thread dump signal arrives
then the task can exit with a "org.apache.hadoop.mapred.Task: Parent died." message and no
thread dump.

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