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From "Devaraj K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-685) Capacity Scheduler is not distributing the reducers tasks across the cluster
Date Wed, 10 Jul 2013 02:00:48 GMT

    [ https://issues.apache.org/jira/browse/YARN-685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704116#comment-13704116
] 

Devaraj K commented on YARN-685:
--------------------------------

We can reproduce this. In a cluster having multiple NM's, Submit a Job(any Job) having some
number of reducers whose total memory(i.e resources) required to complete the reducers is
less than available memory(i.e resources) in the cluster. These reducers are not distributing
across the cluster, instead they are getting assigned to only few nodes.
                
> Capacity Scheduler is not distributing the reducers tasks across the cluster
> ----------------------------------------------------------------------------
>
>                 Key: YARN-685
>                 URL: https://issues.apache.org/jira/browse/YARN-685
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.0.4-alpha
>            Reporter: Devaraj K
>
> If we have reducers whose total memory required to complete is less than the total cluster
memory, it is not assigning the reducers to all the nodes uniformly(~uniformly). Also at that
time there are no other jobs or job tasks running in the cluster.

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