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https://issues.apache.org/jira/browse/YARN-8191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16473961#comment-16473961
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Gergo Repas commented on YARN-8191:
-----------------------------------
[~wilfreds] Thanks for the explanation. I think returning *true* when
removeEmptyIncompatibleQueues() does not remove the queue is intentional, as
the javadoc of removeEmptyIncompatibleQueues() says: @return true if we can
create queueToCreate or it already exists. But this is rather confusing, I'm
thinking a way to refactor this (possibly to split up
removeEmptyIncompatibleQueues()).
> Fair scheduler: queue deletion without RM restart
> -------------------------------------------------
>
> Key: YARN-8191
> URL: https://issues.apache.org/jira/browse/YARN-8191
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: fairscheduler
> Affects Versions: 3.0.1
> Reporter: Gergo Repas
> Assignee: Gergo Repas
> Priority: Major
> Attachments: Queue Deletion in Fair Scheduler.pdf,
> YARN-8191.000.patch, YARN-8191.001.patch, YARN-8191.002.patch,
> YARN-8191.003.patch, YARN-8191.004.patch, YARN-8191.005.patch,
> YARN-8191.006.patch, YARN-8191.007.patch, YARN-8191.008.patch,
> YARN-8191.009.patch, YARN-8191.010.patch
>
>
> The Fair Scheduler never cleans up queues even if they are deleted in the
> allocation file, or were dynamically created and are never going to be used
> again. Queues always remain in memory which leads to two following issues.
> # Steady fairshares aren’t calculated correctly due to remaining queues
> # WebUI shows deleted queues, which is confusing for users (YARN-4022).
> We want to support proper queue deletion without restarting the Resource
> Manager:
> # Static queues without any entries that are removed from fair-scheduler.xml
> should be deleted from memory.
> # Dynamic queues without any entries should be deleted.
> # RM Web UI should only show the queues defined in the scheduler at that
> point in time.
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