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https://issues.apache.org/jira/browse/YARN-9930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17133368#comment-17133368
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Peter Bacsko commented on YARN-9930:
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OK, I did some extra testing.
# Limit max-parallel-apps to 2, submit 4 apps, then refresh it to 4. Result:
pending apps transitioned to Running state.
# Limit max-parallel-apps to 4, submit 4 apps, then refresh it to 2. Result:
running apps were still running, but new apps stayed in Accepted state. >From
that point on, only 2 apps were allowed to run at the same time.
I also did other manual tests:
# Limit max-parallel-apps to 2 for all users, then override to 4 for a
specific user. Result: specific user could run 4 apps. Other user could only
run 2 apps.
# Limit max-parallel-apps to 2 for the "root" queue and submit apps to a leaf
queue. Result: leaf queue could only run 2 apps in parallel, which is expected.
To me it looks functionally correct.
> 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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