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https://issues.apache.org/jira/browse/YARN-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564211#comment-14564211
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Xianyin Xin commented on YARN-3547:
-----------------------------------

Sorry [~kasha], i correct the comment in 
https://issues.apache.org/jira/browse/YARN-3547?focusedCommentId=14564204&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14564204.
 I firstly use Resources.greaterThan(Resources.none()), which is not suitable 
for zero memory container request. But {{(!pending.equals(Resources.none())}} 
can.

> FairScheduler: Apps that have no resource demand should not participate 
> scheduling
> ----------------------------------------------------------------------------------
>
>                 Key: YARN-3547
>                 URL: https://issues.apache.org/jira/browse/YARN-3547
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>            Reporter: Xianyin Xin
>            Assignee: Xianyin Xin
>         Attachments: YARN-3547.001.patch, YARN-3547.002.patch, 
> YARN-3547.003.patch, YARN-3547.004.patch, YARN-3547.005.patch, 
> YARN-3547.006.patch
>
>
> At present, all of the 'running' apps participate the scheduling process, 
> however, most of them may have no resource demand on a production cluster, as 
> the app's status is running other than waiting for resource at the most of 
> the app's lifetime. It's not a wise way we sort all the 'running' apps and 
> try to fulfill them, especially on a large-scale cluster which has heavy 
> scheduling load. 



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