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https://issues.apache.org/jira/browse/YARN-5323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15453483#comment-15453483
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Carlo Curino commented on YARN-5323:
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[~giovanni.fumarola] and [~subru] thanks for your comments. 

I addressed all of them expect [~subru]'s FederationStateStoreFacade one. 
The rationale for leaving the API as is, is that it makes it evident to the 
implementor that 
the set of active sub-cluster could be changing over time, and should be handle 
with care. 
This way the code is (not completely, but close to) functional, which I like 
for the policies.

 



> Policies APIs (for Router and AMRMProxy policies)
> -------------------------------------------------
>
>                 Key: YARN-5323
>                 URL: https://issues.apache.org/jira/browse/YARN-5323
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>    Affects Versions: YARN-2915
>            Reporter: Carlo Curino
>            Assignee: Carlo Curino
>         Attachments: YARN-5323-YARN-2915.05.patch, 
> YARN-5323-YARN-2915.06.patch, YARN-5323.01.patch, YARN-5323.02.patch, 
> YARN-5323.03.patch, YARN-5323.04.patch
>
>
> This JIRA tracks APIs for the policies that will guide the Router and 
> AMRMProxy decisions on where to fwd the jobs submission/query requests as 
> well as ResourceRequests.



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