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https://issues.apache.org/jira/browse/YARN-6151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854851#comment-15854851
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ASF GitHub Bot commented on YARN-6151:
--------------------------------------
GitHub user flyrain opened a pull request:
https://github.com/apache/hadoop/pull/188
YARN-6151. FS Preemption doesn't filter out queues which cannot be pr…
…eempted.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/flyrain/hadoop branch-2.8
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/hadoop/pull/188.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #188
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commit 5691fdff2b400571bb4669daf6e25791aaaa0db9
Author: Yufei Gu <[email protected]>
Date: 2017-02-06T20:57:05Z
YARN-6151. FS Preemption doesn't filter out queues which cannot be
preempted.
----
> FS Preemption doesn't filter out queues which cannot be preempted
> -----------------------------------------------------------------
>
> Key: YARN-6151
> URL: https://issues.apache.org/jira/browse/YARN-6151
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.8.0
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Attachments: YARN-6151.branch-2.8.001.patch
>
>
> This is preemption bug happens before 2.8.0, which also described in
> YARN-3405.
> Queue hierarchy described as below:
> {noformat}
> root
> / \
> queue-1 queue-2
> / \
> queue-1-1 queue-1-2
> {noformat}
> Assume cluster resource is 100 and all queues have same weights.
> # queue-1-1 and queue-2 has apps. Each get 50 usage and 50 fairshare.
> # When queue-1-2 is active, supposedly it will preempt 25 from queue-1-1, but
> this doesn't happen because preemption happens top-down, queue-2 could be the
> preemption candidate as long as queue-2 is less needy than queue-1, and
> queue-2 doesn't exceed the fair share which means preemption won't happen.
> We need to filter out queue-2 since it isn't a valid candidate.
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