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From "Zian Chen (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (YARN-7274) Ability to disable elasticity at leaf queue level
Date Tue, 14 Nov 2017 00:32:00 GMT

     [ https://issues.apache.org/jira/browse/YARN-7274?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zian Chen reassigned YARN-7274:

    Assignee: Zian Chen

> 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) ? 
> {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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