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From "Naganarasimha G R (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-3945) maxApplicationsPerUser is wrongly calculated
Date Wed, 29 Jul 2015 02:30:04 GMT

     [ https://issues.apache.org/jira/browse/YARN-3945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Naganarasimha G R updated YARN-3945:
------------------------------------
    Attachment: YARN-3945.20150728-1.patch

> maxApplicationsPerUser is wrongly calculated
> --------------------------------------------
>
>                 Key: YARN-3945
>                 URL: https://issues.apache.org/jira/browse/YARN-3945
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 2.7.1
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>         Attachments: YARN-3945.20150728-1.patch
>
>
> maxApplicationsPerUser is currently calculated based on the formula
> {{maxApplicationsPerUser = (int)(maxApplications * (userLimit / 100.0f) * userLimitFactor)}}
but description of userlimit is 
> {quote}
> 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.{color:red} The the former (the minimum value) is set to this property value
{color} and the latter (the maximum value) depends on the number of users who have submitted
applications. For e.g., suppose the value of this property is 25. If two users have submitted
applications to a queue, no single user can use more than 50% of the queue resources. If a
third user submits an application, no single user can use more than 33% of the queue resources.
With 4 or more users, no user can use more than 25% of the queues resources. A value of 100
implies no user limits are imposed. The default is 100. Value is specified as a integer.
> {quote}
> configuration related to minimum limit should not be made used in a formula to calculate
max applications for a user



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