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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7053) Timed out tasks can fail to produce thread dump
Date Wed, 14 Feb 2018 17:26:01 GMT
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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