Wangda Tan commented on YARN-3547:

[~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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