[jira] [Created] (MAPREDUCE-5000) TaskImpl.getCounters() can return the counters for the wrong task attempt when task is speculating

["Jason Lowe (JIRA)" <ji...@apache.org>]

Jason Lowe created MAPREDUCE-5000:
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             Summary: TaskImpl.getCounters() can return the counters for the wrong task attempt when task is speculating
                 Key: MAPREDUCE-5000
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5000
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: mr-am
    Affects Versions: 0.23.6
            Reporter: Jason Lowe
            Priority: Critical


When a task is speculating and one attempt completes then sometimes the counters for the wrong attempt are aggregated into the total counters for the job.  The scenario looks like this:

# Two task attempts are racing, _0 and _1
# _1 finishes first, causing the task to issue a TA_KILL to attempt _0
# _0 receives TA_KILL, sets progress to 1.0f and waits for container cleanup
# if TaskImpl.getCounters() is called now, TaskImpl.selectBestAttempt() can return _0 since it is not quite yet in the KILLED state yet progress is maxed out and no other attempt has more progress.


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