Jonathan Hung created YARN-9730:
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Summary: Support forcing configured partitions to be exclusive
based on app node label
Key: YARN-9730
URL: https://issues.apache.org/jira/browse/YARN-9730
Project: Hadoop YARN
Issue Type: Task
Reporter: Jonathan Hung
Assignee: Jonathan Hung
Use case: queue X has all of its workload in non-default (exclusive) partition
P (by setting app submission context's node label set to P). Node in partition
Q != P heartbeats to RM. Capacity scheduler loops through every application in
X, and every scheduler key in this application, and fails to allocate each time
since the app's requested label and the node's label don't match. This causes
huge performance degradation when number of apps in X is large.
To fix the issue, allow RM to configure partitions as "forced-exclusive". If
partition P is "forced-exclusive", then:
* If app sets its submission context's node label to P, all its resource
requests will be overridden to P
* If app sets its submission context's node label Q, any of its resource
requests whose labels are P will be overridden to Q
* In the scheduler, we add apps with node label expression P to a separate
data structure. When a node in partition P heartbeats to scheduler, we only try
to schedule apps in this data structure. When a node in partition Q heartbeats
to scheduler, we schedule the rest of the apps as normal.
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