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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2113) Add cross-user preemption within CapacityScheduler's leaf-queue
Date Mon, 27 Mar 2017 23:42:42 GMT

    [ https://issues.apache.org/jira/browse/YARN-2113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15944243#comment-15944243
] 

Wangda Tan commented on YARN-2113:
----------------------------------

[~jlowe]/[~eepayne]. 

Discussed with [~sunilg]/[~vinodkv] offline. I think for different use cases, they may prefer
to treat precedence of user limit and priority differently. For example, for some use cases
they may want per-priority user-limit, so higher priority apps can always get preferred. So
this could be a policy-driven behavior.

For now we're fine with what you suggested, which user limit takes precedence, and once we
have user-limit policy, we can make this to be a default policy. And per_priority user_limit
can be done in a much lower priority.

Also, discussed detailed implementations with [~sunilg], we came up with an implementation
which can address both of existing user-limit and per-priority user-limit. Sunil will update
the patch shortly.

Thanks,

> Add cross-user preemption within CapacityScheduler's leaf-queue
> ---------------------------------------------------------------
>
>                 Key: YARN-2113
>                 URL: https://issues.apache.org/jira/browse/YARN-2113
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: scheduler
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Sunil G
>         Attachments: YARN-2113.0001.patch, YARN-2113.0002.patch, YARN-2113.0003.patch,
YARN-2113.v0.patch
>
>
> Preemption today only works across queues and moves around resources across queues per
demand and usage. We should also have user-level preemption within a queue, to balance capacity
across users in a predictable manner.



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