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https://issues.apache.org/jira/browse/YARN-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15263109#comment-15263109
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Nathan Roberts commented on YARN-4963:
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Sorry it took so long to get back to this. I filed YARN-5013 to handle #2. We
can continue that discussion over there.
> capacity scheduler: Make number of OFF_SWITCH assignments per heartbeat
> configurable
> ------------------------------------------------------------------------------------
>
> Key: YARN-4963
> URL: https://issues.apache.org/jira/browse/YARN-4963
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacityscheduler
> Affects Versions: 3.0.0, 2.7.2
> Reporter: Nathan Roberts
> Assignee: Nathan Roberts
> Attachments: YARN-4963.001.patch
>
>
> Currently the capacity scheduler will allow exactly 1 OFF_SWITCH assignment
> per heartbeat. With more and more non MapReduce workloads coming along, the
> degree of locality is declining, causing scheduling to be significantly
> slower. It's still important to limit the number of OFF_SWITCH assignments to
> avoid densely packing OFF_SWITCH containers onto nodes.
> Proposal is to add a simple config that makes the number of OFF_SWITCH
> assignments configurable.
> Will upload candidate patch shortly.
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