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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1495) Allow moving apps between queues
Date Wed, 12 Feb 2014 00:46:24 GMT

    [ https://issues.apache.org/jira/browse/YARN-1495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13898568#comment-13898568
] 

Sandy Ryza commented on YARN-1495:
----------------------------------

bq. From an API point of view, there should be a way for the application at run-time/registration
time to find out what features are supported or not supported by the currently configured
scheduler in the RM.
That makes total sense to me.

bq. Now, for moving apps across schedulers - given that it is a client only feature and there
is no changes required in an application, my previous comment's argument does not hold for
this feature.
Great.  Will go forward with the merge to branch-2.

> Allow moving apps between queues
> --------------------------------
>
>                 Key: YARN-1495
>                 URL: https://issues.apache.org/jira/browse/YARN-1495
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: scheduler
>    Affects Versions: 2.2.0
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>
> This is an umbrella JIRA for work needed to allow moving YARN applications from one queue
to another.  The work will consist of additions in the command line options, additions in
the client RM protocol, and changes in the schedulers to support this.
> I have a picture of how this should function in the Fair Scheduler, but I'm not familiar
enough with the Capacity Scheduler for the same there.  Ultimately, the decision to whether
an application can be moved should go down to the scheduler - some schedulers may wish not
to support this at all.  However, schedulers that do support it should share some common semantics
around ACLs and what happens to running containers.
> Here is how I see the general semantics working out:
> * A move request is issued by the client.  After it gets past ACLs, the scheduler checks
whether executing the move will violate any constraints. For the Fair Scheduler, these would
be queue maxRunningApps and queue maxResources constraints
> * All running containers are transferred from the old queue to the new queue
> * All outstanding requests are transferred from the old queue to the new queue
> Here is I see the ACLs of this working out:
> * To move an app from a queue a user must have modify access on the app or administer
access on the queue
> * To move an app to a queue a user must have submit access on the queue or administer
access on the queue 



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