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From "Nathan Roberts (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4963) capacity scheduler: Make number of OFF_SWITCH assignments per heartbeat configurable
Date Thu, 12 May 2016 18:09:13 GMT

     [ https://issues.apache.org/jira/browse/YARN-4963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nathan Roberts updated YARN-4963:
---------------------------------
    Attachment: YARN-4963.003.patch

Thank you [~leftnoteasy] for the comments!

I have addressed them in the latest patch.


> 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, YARN-4963.002.patch, YARN-4963.003.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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