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https://issues.apache.org/jira/browse/YARN-7863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16589605#comment-16589605
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Weiwei Yang commented on YARN-7863:
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Hi [~Naganarasimha]
Unlike partitions, PC is not associated with resource,
{quote}there is no way to find out for a given queue how much pending resources
are there in each partition it can access.
{quote}
PCs are not associated with resource, so it's like an extra check after all
other checks are done. Scheduler still calculates how much resource available
in a partition for a given queue, assign resource from a node in this partition
to a request, but if PC is not satisfied then the allocation proposal will be
rejected. Partition in PC is not ready, to be honest, I am not sure if
everything is align with existing label-based scheduling. I suggested in
YARN-8015 to open a separate task for further enhance that.
{quote}And also i am not able to envisage the scenario where in partition needs
to be OR'd with Allocation tags or Attributes.
{quote}
Agree, it won't make sense to put a OR between a partition constraint and a
allocation-tag/attribute constraint. But other combinations are useful. We
support this, however if a PC is really meaningful that is up to the user.
> Modify placement constraints to support node attributes
> -------------------------------------------------------
>
> Key: YARN-7863
> URL: https://issues.apache.org/jira/browse/YARN-7863
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Sunil Govindan
> Assignee: Sunil Govindan
> Priority: Major
> Attachments: YARN-7863-YARN-3409.002.patch,
> YARN-7863-YARN-3409.003.patch, YARN-7863-YARN-3409.004.patch,
> YARN-7863-YARN-3409.005.patch, YARN-7863-YARN-3409.006.patch,
> YARN-7863-YARN-3409.007.patch, YARN-7863-YARN-3409.008.patch,
> YARN-7863.v0.patch
>
>
> This Jira will track to *Modify existing placement constraints to support
> node attributes.*
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