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https://issues.apache.org/jira/browse/YARN-7274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16256195#comment-16256195
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Wangda Tan commented on YARN-7274:
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[~asuresh], could you share your thoughts on this as well?
> Ability to disable elasticity at leaf queue level
> -------------------------------------------------
>
> Key: YARN-7274
> URL: https://issues.apache.org/jira/browse/YARN-7274
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: capacityscheduler
> Reporter: Scott Brokaw
> Assignee: Zian Chen
>
> The
> [documentation|https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html]
> defines yarn.scheduler.capacity.<queue-path>.maximum-capacity as "Maximum
> queue capacity in percentage (%) as a float. This limits the elasticity for
> applications in the queue. Defaults to -1 which disables it."
> However, setting this value to -1 sets maximum capacity to 100% but I thought
> (perhaps incorrectly) that the intention of the -1 setting is that it would
> disable elasticity. This is confirmed looking at the code:
> {code:java}
> public static final float MAXIMUM_CAPACITY_VALUE = 100;
> public static final float DEFAULT_MAXIMUM_CAPACITY_VALUE = -1.0f;
> ......
> maxCapacity = (maxCapacity == DEFAULT_MAXIMUM_CAPACITY_VALUE) ?
> MAXIMUM_CAPACITY_VALUE : maxCapacity;
> {code}
> The sum of yarn.scheduler.capacity.<queue-path>.capacity for all queues, at
> each level, must be equal to 100 but for
> yarn.scheduler.capacity.<queue-path>.maximum-capacity this value is actually
> a percentage of the entire cluster not just the parent queue. Yet it can not
> be set lower then the leaf queue's capacity setting. This seems to make it
> impossible to disable elasticity at a leaf queue level.
> This improvement is proposing that YARN have the ability to have elasticity
> disabled at a leaf queue level even if a parent queue permits elasticity by
> having a yarn.scheduler.capacity.<queue-path>.maximum-capacity greater then
> it's yarn.scheduler.capacity.<queue-path>.capacity
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