[jira] [Assigned] (MAPREDUCE-6501) Improve reducer preemption

["Gergő Pásztor (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gergő Pásztor reassigned MAPREDUCE-6501:
----------------------------------------

    Assignee: Peter Bacsko  (was: Gergő Pásztor)

> Improve reducer preemption
> --------------------------
>
>                 Key: MAPREDUCE-6501
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6501
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: applicationmaster
>    Affects Versions: 2.7.1
>            Reporter: Karthik Kambatla
>            Assignee: Peter Bacsko
>
> As discussed on MAPREDUCE-6302, we could improve the reducer preemption as follows:
> # preempt enough reducers so there are enough mappers to match slowstart 
> # prioritize preempting reducers that are still in SHUFFLE phase
> # add an option to not preempt reducers that are past SHUFFLE phase irrespective of slowstart as long as one mapper can run
> We could do it all in one patch or create subtasks as necessary. 



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