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https://issues.apache.org/jira/browse/YARN-7681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16314340#comment-16314340
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Weiwei Yang commented on YARN-7681:
-----------------------------------
Hi [~asuresh], [~leftnoteasy]
I think [~leftnoteasy] has done the check in YARN-6599, via
{{AppPlacementAllocator#canAllocate}}, I saw this is already implemented by
{{SingleConstraintAppPlacementAllocator#checkCardinalityAndPending}}.
[~leftnoteasy], I am not sure what you mean by 2 approaches to allocate
SchedulingRequest. The 1st approach {{PlacementProcessor}} will eventually call
{code}
scheduler.attemptAllocationOnNode(
applicationAttempt, sReqClone, node);
{code}
this calls scheduler's {{tryCommit}} method and in which
{{AppPlacementAllocator}} makes some validation before actual allocation. So as
long as your patch has done the check, we should be fine. Am I missing anything
here?
Thanks
> Scheduler should double-check placement constraint before actual allocation
> is made
> -----------------------------------------------------------------------------------
>
> Key: YARN-7681
> URL: https://issues.apache.org/jira/browse/YARN-7681
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: RM, scheduler
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
>
> This JIRA is created based on the discussions under YARN-7612, see comments
> after [this
> comment|https://issues.apache.org/jira/browse/YARN-7612?focusedCommentId=16303051&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16303051].
> AllocationTagsManager maintains tags info that helps to make placement
> decisions at placement phase, however tags are changing along with
> container's lifecycle, so it is possible that the placement violates the
> constraints at the scheduling phase. Propose to add an extra check in the
> scheduler to make sure constraints are still satisfied during the actual
> allocation.
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