[jira] [Created] (MAPREDUCE-3294) Log the reason for killing a task during speculative execution

["Ramya Sunil (Created) (JIRA)" <ji...@apache.org>]

Log the reason for killing a task during speculative execution
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                 Key: MAPREDUCE-3294
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3294
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 0.23.0
            Reporter: Ramya Sunil
             Fix For: 0.23.0


The reason for killing a speculated task has to be logged. Currently, a speculated task is killed with a note of "Container killed by the ApplicationMaster. Container killed on request. Exit code is 137" which is not very useful. Better logging of this message stating the task was killed due to completion of its speculative task would be useful.

Also, this message is lost once the app is moved to history. All we are left with is a list of killed tasks without a reason being notified to the user.

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