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https://issues.apache.org/jira/browse/YARN-9930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118899#comment-17118899
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Peter Bacsko edited comment on YARN-9930 at 5/28/20, 5:03 PM:
--------------------------------------------------------------

Created a POC based on the solution exists in FS. No tests yet at all.

Note that I copy-pasted {{MaxRunningAppsEnforcer}}. I started to refactor it so 
that a single class could serve both FS and CS but the it required way too many 
changes. The class is heavily tied to FS. So I created 
{{CSMaxRunningAppsEnforcer}}.



was (Author: pbacsko):
Created a POC based on the solution exists in FS. No tests yet at all.

Note that I copy-pasted {{MaxRunningAppsEnforcer}}. I started to refactor it so 
that a single class could serve both FS and CS but it just got too big. The 
class is heavily tied to FS. So I created {{CSMaxRunningAppsEnforcer}}.


> 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: zhoukang
>            Priority: Major
>         Attachments: YARN-9930-POC01.patch
>
>
> 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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