[jira] [Commented] (MAPREDUCE-5612) Document TaskAttemptCompletionEventStatuses

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

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13819074#comment-13819074 ] 

Jason Lowe commented on MAPREDUCE-5612:
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As I understand it, FAILED indicates an attempt fails but there are attempts remaining.  TIPFAILED indicates an attempt failed and no further attempts will be made (i.e.: reached max attempts).  When a reducer receives a TIPFAILED event it gives up trying to shuffle data from that map task.

OBSOLETE is used to override a previously successful event status.  For example, a map attempt runs on node A and a SUCCEEDED event is sent.  Later the task is retroactively failed due to excessive fetch failures during the shuffle phase.  When that retroactive attempt failure occurs, an OBSOLETE event is sent for that map attempt to indicate the prior event is no longer valid.

> Document TaskAttemptCompletionEventStatuses
> -------------------------------------------
>
>                 Key: MAPREDUCE-5612
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5612
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 2.2.0
>            Reporter: Sandy Ryza
>            Priority: Minor
>              Labels: newbie
>
> What's the difference between FAILED and TIPFAILED?  What is OBSOLETE?



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