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https://issues.apache.org/jira/browse/MAPREDUCE-3483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168628#comment-13168628
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Arun C Murthy commented on MAPREDUCE-3483:
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So, Thomas - the queue only had 10G as the limit?
> CapacityScheduler reserves container on same node as AM but can't ever use
> due to never enough avail memory
> -----------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3483
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3483
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Thomas Graves
> Assignee: Arun C Murthy
> Priority: Blocker
>
> Saw a case where a job was stuck trying to get reducers. The issue is the
> capacity scheduler reserved a container on the same node as the application
> master but there wasn't ever enough memory to run the reducer on that node.
> Node total memory was 8G, Reducer needed 8G, AM was using 2G. This
> particular job had 10 reducers and it was stuck waiting on the one because
> the AM + reserved reducer memory was already over the queue limit.
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