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From "Manikandan R (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (YARN-4606) CapacityScheduler: applications could get starved because computation of #activeUsers considers pending apps
Date Wed, 31 Jan 2018 17:32:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-4606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347236#comment-16347236
] 

Manikandan R edited comment on YARN-4606 at 1/31/18 5:31 PM:
-------------------------------------------------------------

Thanks [~eepayne] [~sunilg] for your comments. 
{quote}And when we need to know all active users in cluster (for user-limit computation etc)
we might need to use activeUsers+activeUsersOfPendingApps.{quote}
Shouldn't we use activeUsersOfPendingApps only for user limit calculation? Otherwise, based
on the example given in the description, Won't we end up in same situation (2+2 == 4 )? Please
correct my understanding.

 


was (Author: manirajv06@gmail.com):
Thanks [~eepayne] [~sunilg] for your comments.

{quote}And when we need to know all active users in cluster (for user-limit computation etc)
we might need to use activeUsers+activeUsersOfPendingApps.\{quote}

Shouldn't we use activeUsersOfPendingApps only for user limit calculation? Otherwise, based
on the example given in the description, Won't we end up in same situation (2+2 == 4 )? Please
correct my understanding.

 

> CapacityScheduler: applications could get starved because computation of #activeUsers
considers pending apps 
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-4606
>                 URL: https://issues.apache.org/jira/browse/YARN-4606
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, capacityscheduler
>    Affects Versions: 2.8.0, 2.7.1
>            Reporter: Karam Singh
>            Assignee: Wangda Tan
>            Priority: Critical
>         Attachments: YARN-4606.1.poc.patch
>
>
> Currently, if all applications belong to same user in LeafQueue are pending (caused by
max-am-percent, etc.), ActiveUsersManager still considers the user is an active user. This
could lead to starvation of active applications, for example:
> - App1(belongs to user1)/app2(belongs to user2) are active, app3(belongs to user3)/app4(belongs
to user4) are pending
> - ActiveUsersManager returns #active-users=4
> - However, there're only two users (user1/user2) are able to allocate new resources.
So computed user-limit-resource could be lower than expected.



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