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https://issues.apache.org/jira/browse/YARN-7599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16619449#comment-16619449
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Botong Huang commented on YARN-7599:
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bq. One concern is the response size
Yeah we've hit this exact same problem in our federated cluster. That's why I 
added "RMWSConsts.DESELECTS" (introduced in YARN-6280) when calling getApps to 
Router in _GPGUtils_. The _ResourceRequest_ entries occupy a significant 
portion of the appInfo response. In our prod cluster, this deselect reduces the 
getApps call latency from 20 mins to seconds. 

> [GPG] ApplicationCleaner in Global Policy Generator
> ---------------------------------------------------
>
>                 Key: YARN-7599
>                 URL: https://issues.apache.org/jira/browse/YARN-7599
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Botong Huang
>            Assignee: Botong Huang
>            Priority: Minor
>              Labels: federation, gpg
>         Attachments: YARN-7599-YARN-7402.v1.patch, 
> YARN-7599-YARN-7402.v2.patch, YARN-7599-YARN-7402.v3.patch, 
> YARN-7599-YARN-7402.v4.patch
>
>
> In Federation, we need a cleanup service for StateStore as well as Yarn 
> Registry. For the former, we need to remove old application records. For the 
> latter, failed and killed applications might leave records in the Yarn 
> Registry (see YARN-6128). We plan to do both cleanup work in 
> ApplicationCleaner in GPG



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