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https://issues.apache.org/jira/browse/YARN-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14626186#comment-14626186
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Ajith S commented on YARN-3885:
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Hi [~leftnoteasy], thanks for the input
The testcase i have added, has the same scenario, as you can see form the log
snippet, the QueueA has 9 extra(209-200) which is less than
sum(queue.children.preemptable) is 10. But the check
{code}
if (Resources.greaterThanOrEqual(
rc, partitionResource, childrensPreemptable, extra)) {
ret.untouchableExtra = Resource.newInstance(0, 0);
{code}
makes the queueA untouchable=0, therefore resulting in correct preemption
Please correct me if i am wrong
> ProportionalCapacityPreemptionPolicy doesn't preempt if queue is more than 2
> level
> ----------------------------------------------------------------------------------
>
> Key: YARN-3885
> URL: https://issues.apache.org/jira/browse/YARN-3885
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 2.8.0
> Reporter: Ajith S
> Assignee: Ajith S
> Priority: Blocker
> Attachments: YARN-3885.02.patch, YARN-3885.03.patch,
> YARN-3885.04.patch, YARN-3885.patch
>
>
> when preemption policy is {{ProportionalCapacityPreemptionPolicy.cloneQueues}}
> this piece of code, to calculate {{untoucable}} doesnt consider al the
> children, it considers only immediate childern
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