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https://issues.apache.org/jira/browse/MAPREDUCE-4330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13621382#comment-13621382
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Siddharth Seth commented on MAPREDUCE-4330:
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I think it's best to keep track of a single completion event. Re-launch the
task if this one happens to fail. That remains closer to the current logic
where only a single completion event is remembered per task - and is likely
less complicated.
> TaskAttemptCompletedEventTransition invalidates previously successful attempt
> without checking if the newly completed attempt is successful
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4330
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4330
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.23.1
> Reporter: Bikas Saha
> Assignee: Omkar Vinit Joshi
> Attachments: MAPREDUCE-4330-21032013.1.patch,
> MAPREDUCE-4330-21032013.patch
>
>
> The previously completed attempt is removed from
> successAttemptCompletionEventNoMap and marked OBSOLETE.
> After that, if the newly completed attempt is successful then it is added to
> the successAttemptCompletionEventNoMap.
> This seems wrong because the newly completed attempt could be failed and thus
> there is no need to invalidate the successful attempt.
> One error case would be when a speculative attempt completes with
> killed/failed after the successful version has completed.
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