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

["Amareshwari Sriramadasu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amareshwari Sriramadasu updated MAPREDUCE-618:
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        Summary: Need to be able to re-run specific map tasks (when -reducer NONE)  (was: Streaming: need to be able to re-run specific map tasks (when -reducer NONE))
     Issue Type: Improvement  (was: Bug)
    Component/s:     (was: contrib/streaming)

> 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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