[jira] [Commented] (YARN-8792) Revisit FairScheduler QueuePlacementPolicy

["Wilfred Spiegelenburg (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-8792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16802707#comment-16802707 ] 

Wilfred Spiegelenburg commented on YARN-8792:
---------------------------------------------

None of these changes fit into the integrated way we currently implement the rules in the FS and CS.
As part of YARN-8948, YARN-9298 and finally integrated in YARN-8967 this has been changed. Both schedulers now use the same placement manager and placement rule code. The placement of the application in a queue is moved out of the FS also.

> Revisit FairScheduler QueuePlacementPolicy 
> -------------------------------------------
>
>                 Key: YARN-8792
>                 URL: https://issues.apache.org/jira/browse/YARN-8792
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: fairscheduler
>    Affects Versions: 3.1.1
>            Reporter: Shuai Zhang
>            Assignee: Shuai Zhang
>            Priority: Major
>
> Fair scheduler use `QueuePlacementPolicy` to map a request to queue. There are several problems:
>  # The termination of the responsibility chain should bind to the assigning result instead of the rule.
>  # It should provide a reason when rejecting a request.
>  # Still need more useful rules:
>  ## RejectNonLeafQueue
>  ## RejectDefaultQueue
>  ## RejectUsers
>  ## RejectQueues
>  ## DefaultByUser



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