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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-521) Augment AM - RM client module to be able to request containers only at specific locations
Date Thu, 11 Jul 2013 15:37:50 GMT

    [ https://issues.apache.org/jira/browse/YARN-521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705924#comment-13705924
] 

Sandy Ryza commented on YARN-521:
---------------------------------

bq. However, I will be cautious about making changes to the API because once we release it
in the beta then it will be hard to change them.
I 100% agree that we should take the time to get this right the first time, as it will hopefully
be used extensively and far down the road. I appreciate you helping me work through this.

bq. The method is supposed to give me requests that I can assign based on the parameters of
priority, capability and location.
I see.  In that case your solution makes sense to me.  Essentially, it would never make sense
to call getMatchingRequests at *-level when locality-relaxation is turned on, right?

bq. Looks like we have forgotten StoredContainerRequest in these changes. Its constructor
also needs to account for the new flag.
I'll add that in.

Here's a stab at enumerating all the safe cases:
ContainerRequests without locality relaxation may contain multiple racks and multiple nodes,
but must contain at least one of one of them. Requests with locality relaxation off may not
coexist at the same priority as requests with locality relaxation on.  Multiple requests without
locality relaxation may coexist at the same priority if any of the following are true:
* All the requests specify only nodes
* All the requests specify only racks
* All the requests specify the corresponding rack for each node they specify
* For any requests that specify nodes without their corresponding racks, no other requests
specify those racks
                
> Augment AM - RM client module to be able to request containers only at specific locations
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-521
>                 URL: https://issues.apache.org/jira/browse/YARN-521
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>    Affects Versions: 2.0.3-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: YARN-521-1.patch, YARN-521-2.patch, YARN-521-2.patch, YARN-521-3.patch,
YARN-521.patch
>
>
> When YARN-392 and YARN-398 are completed, it would be good for AMRMClient to offer an
easy way to access their functionality

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