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https://issues.apache.org/jira/browse/YARN-6151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yufei Gu updated YARN-6151:
---------------------------
Description:
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.
> 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
>
> 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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