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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5892) Capacity Scheduler: Support user-specific minimum user limit percent
Date Mon, 24 Apr 2017 21:54:04 GMT

    [ https://issues.apache.org/jira/browse/YARN-5892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981974#comment-15981974
] 

Wangda Tan commented on YARN-5892:
----------------------------------

[~eepayne], [~jlowe], ideally MULP is guaranteed resource for users in the queue.

>From https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html
bq. Each queue enforces a limit on the percentage of resources allocated to a user at any
given time, if there is demand for resources. The user limit can vary between a minimum and
maximum value. The former (the minimum value) is set to this property value and the latter
(the maximum value) depends on the number of users who have submitted applications. 

 In reality there could be more than 100/MULP users run their application in the queue, so
some users cannot get the minimum resource. But to me it doesn't make sense to say a user's
minimum resource can be more than queue's configured capacity. Previously we didn't enforce
MULP <= 100, it was a mistake to me, we should fix it.

> Capacity Scheduler: Support user-specific minimum user limit percent
> --------------------------------------------------------------------
>
>                 Key: YARN-5892
>                 URL: https://issues.apache.org/jira/browse/YARN-5892
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: capacityscheduler
>            Reporter: Eric Payne
>            Assignee: Eric Payne
>         Attachments: Active users highlighted.jpg, YARN-5892.001.patch, YARN-5892.002.patch,
YARN-5892.003.patch, YARN-5892.004.patch, YARN-5892.005.patch, YARN-5892.006.patch, YARN-5892.007.patch,
YARN-5892.008.patch, YARN-5892.009.patch, YARN-5892.010.patch
>
>
> Currently, in the capacity scheduler, the {{minimum-user-limit-percent}} property is
per queue. A cluster admin should be able to set the minimum user limit percent on a per-user
basis within the queue.
> This functionality is needed so that when intra-queue preemption is enabled (YARN-4945
/ YARN-2113), some users can be deemed as more important than other users, and resources from
VIP users won't be as likely to be preempted.
> For example, if the {{getstuffdone}} queue has a MULP of 25 percent, but user {{jane}}
is a power user of queue {{getstuffdone}} and needs to be guaranteed 75 percent, the properties
for {{getstuffdone}} and {{jane}} would look like this:
> {code}
>   <property>
>     <name>yarn.scheduler.capacity.root.getstuffdone.minimum-user-limit-percent</name>
>     <value>25</value>
>   </property>
>   <property>
>     <name>yarn.scheduler.capacity.root.getstuffdone.jane.minimum-user-limit-percent</name>
>     <value>75</value>
>   </property>
> {code}



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