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https://issues.apache.org/jira/browse/YARN-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388503#comment-14388503
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Peng Zhang commented on YARN-3405:
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I test this case in cluster: queue-2 will be preempted until its ResourceUsage(
consumption - preempted resources) equal to its fair share, and will not be
over preempted.
And then no preemption from sibling queue-1-1, and hang there.
> FairScheduler's preemption cannot happen between sibling in some case
> ---------------------------------------------------------------------
>
> Key: YARN-3405
> URL: https://issues.apache.org/jira/browse/YARN-3405
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.7.0
> Reporter: Peng Zhang
> Priority: Critical
>
> Queue hierarchy described as below:
> {noformat}
> root
> / \
> queue-1 queue-2
> / \
> queue-1-1 queue-1-2
> {noformat}
> Assume cluster resource is 100
> # queue-1-1 and queue-2 has app. Each get 50 usage and 50 fairshare.
> # When queue-1-2 is active, and it cause some new preemption request for
> fairshare 25.
> # When preemption from root, it has possibility to find preemption candidate
> is queue-2. If so preemptContainerPreCheck for queue-2 return false because
> it's equal to its fairshare.
> # Finally queue-1-2 will be waiting for resource release form queue-1-1
> itself.
> What I expect here is that queue-1-2 preempt from queue-1-1.
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