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https://issues.apache.org/jira/browse/YARN-7863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590410#comment-16590410
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Naganarasimha G R commented on YARN-7863:
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Thanks [~cheersyang] for the detailed clarification,
{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. et
{quote}
Agree PC's are not directly involved with resource, But IIUC with the new API
:_SchedulingRequest_ for allocation of containers has only PC as the way to
specify partitions which is tied with resource . This is the reason i had my
concerns with the OR. Let me go through the code with new API and understand
whether Partition is handled for all scenarios. I was always under the
impression that there will be a constraint explicitly for the Partition based
on which resources are accounted ( USED, PENDING , RESERVED etc...). But if its
internal to the constraint which is also OR'd with others i am not completely
sure its addressing .
{quote}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}
Let me too try to understand the PC and new api modifications in detail and
then share my feedback in that Jira and anyway its out of the scope for this
jira.
> 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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