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https://issues.apache.org/jira/browse/YARN-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16331834#comment-16331834
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Weiwei Yang commented on YARN-7763:
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Hi [~kkaranasos]
Thanks for the comments, here is my thoughts
{quote}{quote}we should do an instanceof SingleConstraint before the cast
{quote}{quote}
I did not do that because I think we should have something better than
{{instanceof}} to tell which constraint we are dealing with. E.g would a
{{getType}} possible ? That was why I added a TODO in {{canSatisfyConstraints}}
as a placeholder to handle other type of constraints.
{quote}{quote}constraint priority
{quote}{quote}
Hmm... I was thinking the other way around. This way I can have cluster admin
to setup some basic constraints applied to all apps, and at the same time allow
app/user to override constraints if they have special requirement. The behavior
you described sounds like for a certain allocation tag, once defined in global
constraint, that constraint will apply to everywhere; which means it won't
allow different constraint for one same tag. How to allow customization in this
case?
Thanks
> Allow Constraints specified in the SchedulingRequest to override application
> level constraints
> ----------------------------------------------------------------------------------------------
>
> Key: YARN-7763
> URL: https://issues.apache.org/jira/browse/YARN-7763
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Wangda Tan
> Assignee: Weiwei Yang
> Priority: Blocker
> Attachments: YARN-7763-YARN-6592.001.patch,
> YARN-7763-YARN-6592.002.patch, YARN-7763-YARN-6592.003.patch
>
>
> As I mentioned on YARN-6599, we will add SchedulingRequest as part of the
> PlacementConstraintUtil method and both of processor/scheduler implementation
> will use the same logic. The logic looks like:
> {code:java}
> PlacementConstraint pc = schedulingRequest.getPlacementConstraint();
> If (pc == null) {
> pc =
> PlacementConstraintMgr.getPlacementConstraint(schedulingRequest.getAllocationTags());
> }
> // Do placement constraint match ...{code}
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