Jason Lowe created MAPREDUCE-7053:

             Summary: 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

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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