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https://issues.apache.org/jira/browse/YARN-3547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14514609#comment-14514609
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Wangda Tan commented on YARN-3547:
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[~xinxianyin], it seems getAllResourceRequests cannot solve the problem,
off-switch resource request will be kept in the requests map even if there's no
requests. Instead, you can use
SchedulerApplicationAttempt.getAppResourceUsage.getPending > 0 to check if the
app has "real" requests.
> 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: scheduler
> Reporter: Xianyin Xin
> Attachments: YARN-3547.001.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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