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