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From "Ahmed Radwan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4358) Reducers are assigned containers before all maps are assigned containers
Date Thu, 21 Jun 2012 20:08:43 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13398815#comment-13398815
] 

Ahmed Radwan commented on MAPREDUCE-4358:
-----------------------------------------

Will try to see if the capacity scheduler solves this issue. Will update.
                
> Reducers are assigned containers before all maps are assigned containers
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4358
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4358
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.0.0-alpha
>            Reporter: Ahmed Radwan
>
> Reducers start to get containers before all maps are. We have seen this issue and it
is problematic since if there is no avaialable resources for the remaining maps, the job will
just stall where reducers are waiting for mappers which are unable to start because there
is no containers available.

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