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https://issues.apache.org/jira/browse/YARN-9930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17133177#comment-17133177
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Peter Bacsko commented on YARN-9930:
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_"Thanks Peter Bacsko, it will be make sense to create a one-pager doc and talk
about what is the behavior looks like."_
Yes, the upstream documentation should be updated. Either in this ticket or in
a follow-up JIRA.
_"For example, how this feature related to maximum-am-limit."_
It's completely unrelated. If the app attempt is allowed to pass through by
{{CSMaxRunningAppsEnforcer}}, only then comes the max AM percent check, which
can still put the attempt on hold.
The order is: max number of apps --> max number of running apps --> max AM
percent.
_"And how refreshQueue works with this feature (increase #running-app-limit
seems fine, but how about shrink #running-app-limit?)."_
There is already a test for refreshQueue when you increase it. When you
decrease, I think running apps still keep running, but new submissions are not
accepted until the necessary condition is satisfied, but I have to try this out.
> Support max running app logic for CapacityScheduler
> ---------------------------------------------------
>
> Key: YARN-9930
> URL: https://issues.apache.org/jira/browse/YARN-9930
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: capacity scheduler, capacityscheduler
> Affects Versions: 3.1.0, 3.1.1
> Reporter: zhoukang
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: YARN-9930-001.patch, YARN-9930-002.patch,
> YARN-9930-003.patch, YARN-9930-004.patch, YARN-9930-POC01.patch,
> YARN-9930-POC02.patch, YARN-9930-POC03.patch, YARN-9930-POC04.patch,
> YARN-9930-POC05.patch, screenshot-1.png
>
>
> In FairScheduler, there has limitation for max running which will let
> application pending.
> But in CapacityScheduler there has no feature like max running app.Only got
> max app,and jobs will be rejected directly on client.
> This jira i want to implement this semantic for CapacityScheduler.
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