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https://issues.apache.org/jira/browse/YARN-5293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15351650#comment-15351650
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Jonathan Hung commented on YARN-5293:
-------------------------------------
Thanks for the comments, [~Naganarasimha] and [~sunilg]. My initial idea was to
keep the preemption disabled a queue level configuration. So we would have
something like
{{yarn.scheduler.capacity.root.queueQ.accessible-node-labels.labelA.disable_preemption}}
(say this is set to true). This would override the configuration
{{yarn.scheduler.capacity.root.queueQ.disable_preemption}} (say this is set to
false) for labelA, so queueQ should not be preempted for labelA but will be
preempted for other labels.
For the case where
{{yarn.scheduler.capacity.root.queueQ.accessible-node-labels.labelA.disable_preemption}}
is not specified, it should inherit from its parent's per-queue-per-label
configuration (in this case,
{{yarn.scheduler.capacity.root.accessible-node-labels.labelA.disable_preemption}}),
just as it does in the existing code for unlabeled disable_preemption.
Can't currently think of any use cases for disabling preemption for a label. If
we wanted to do this, we could have a configuration like
{{yarn.scheduler.capacity.labelA.disable_preemption}}. If neither
{{yarn.scheduler.capacity.root.queueQ.accessible-node-labels.labelA.disable_preemption}}
or
{{yarn.scheduler.capacity.root.accessible-node-labels.labelA.disable_preemption}}
is specified, it will inherit from
{{yarn.scheduler.capacity.labelA.disable_preemption}}.
One of the results of this is that
{{yarn.scheduler.capacity.root.queueQ.disable_preemption}} no longer has any
effect on disabling preemption for queueQ in labeled partitions. So if a user
wanted to disable preemption for a queue (across all partitions), they would
have to specify this for each partition.
> Disable preemption per queue per partition
> ------------------------------------------
>
> Key: YARN-5293
> URL: https://issues.apache.org/jira/browse/YARN-5293
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Jonathan Hung
>
> [YARN-2056|https://issues.apache.org/jira/browse/YARN-2056] added support for
> disabling preemption at queue level.
> [YARN-2498|https://issues.apache.org/jira/browse/YARN-2498] added support for
> per partition preemption. It would be useful to be able to disable preemption
> per partition per queue, so that if a queue Q has access to two labels A and
> B, we can disable preemption for Q in A but not in B.
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