[jira] [Commented] (MAPREDUCE-618) Need to be able to re-run specific map tasks (when -reducer NONE)

["Allen Wittenauer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065373#comment-14065373 ] 

Allen Wittenauer commented on MAPREDUCE-618:
--------------------------------------------

I'm tempted to close this because retry logic is way better now.  However... isn't this essentially the same request as the various (real) preemption jiras?

> Need to be able to re-run specific map tasks (when -reducer NONE)
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-618
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-618
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: arkady borkovsky
>
> Sometimes, a few map tasks fail and -reducer NONE.  
> It should be possible to rerun the failed map tasks .
> There are several failure modes:
>    * a task is hanging, so the job is killed
>    * from the infrastructure perspective, the task has completed successfully , but it failed to produces correct result
>    * failed in the proper Hadoop sense
> It is often too expensive to rerun the whole job.  And for larger jobs, chances are each run will have a few failed tasks.



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