Jason Lowe updated MAPREDUCE-7053:
    Attachment: MAPREDUCE-7053.001.patch

> 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
>            Assignee: Jason Lowe
>            Priority: Major
>         Attachments: MAPREDUCE-7053.001.patch
> 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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