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https://issues.apache.org/jira/browse/YARN-5889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755304#comment-15755304
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Wangda Tan commented on YARN-5889:
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bq. For preemption calculation, one of the main problem could have been about
the free resources
I think so, but I think the *minimum* preemption threshold is we should not
preempt res from user if used of the user < queue-capacity * MULP. The higher
threshold is, the safer of the preemption.
bq. I think in a busier and short-living app's cluster, we may recalculate more.
I agree with [~eepayne], we should be able to make preemption / allocation UL
calculation independent (or at least it's better to not allocation UL has
dependency on preemption UL). [~sunilg] could you add some details here?
bq. On this note, could I update a patch with approach mentioned above.
Please go ahead when you get chance :). We should generally agree the approach,
there are some debatable details, but starting prototype can help us understand
the scope.
Thoughts?
> Improve user-limit calculation in capacity scheduler
> ----------------------------------------------------
>
> Key: YARN-5889
> URL: https://issues.apache.org/jira/browse/YARN-5889
> Project: Hadoop YARN
> Issue Type: Bug
> Components: capacity scheduler
> Reporter: Sunil G
> Assignee: Sunil G
> Attachments: YARN-5889.v0.patch, YARN-5889.v1.patch,
> YARN-5889.v2.patch
>
>
> Currently user-limit is computed during every heartbeat allocation cycle with
> a write lock. To improve performance, this tickets is focussing on moving
> user-limit calculation out of heartbeat allocation flow.
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