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https://issues.apache.org/jira/browse/MAPREDUCE-5000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-5000:
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Attachment: MAPREDUCE-5000.patch
Patch to have selectBestAttempt use the successful attempt, if available.
> 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
> Assignee: Jason Lowe
> Priority: Critical
> Attachments: MAPREDUCE-5000.patch
>
>
> 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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