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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1495) Allow moving apps between queues
Date Sat, 08 Feb 2014 01:49:21 GMT

    [ https://issues.apache.org/jira/browse/YARN-1495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13895360#comment-13895360
] 

Karthik Kambatla commented on YARN-1495:
----------------------------------------

I agree with Sandy here. If it were a scheduler feature that is fundamental or would bring
the RM down if a scheduler doesn't implement, I think it would be a good idea to not ship/
merge to branch-2. However, moving applications between queues is benign. If the user tries
to move using a scheduler that doesn't support move yet, it would only say moving apps is
not supported. 

It might not be the best analogy, but I think supporting multiple resources in the scheduler
is similar. CS supported it first, but it was okay for users to use related configs while
using FS as well; it just didn't take multiple resources into account. 

> 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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