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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4879) Proposal for a simple (delta) allocate protocol
Date Thu, 31 Mar 2016 16:30:26 GMT

    [ https://issues.apache.org/jira/browse/YARN-4879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220142#comment-15220142
] 

Wangda Tan commented on YARN-4879:
----------------------------------

Overall looks good, thanks [~subru]!

This will be very useful to solve existing request tracking issues.

> Proposal for a simple (delta) allocate protocol
> -----------------------------------------------
>
>                 Key: YARN-4879
>                 URL: https://issues.apache.org/jira/browse/YARN-4879
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: applications, resourcemanager
>            Reporter: Subru Krishnan
>            Assignee: Subru Krishnan
>         Attachments: SimpleAllocateProtocolProposal-v1.pdf
>
>
> For legacy reasons, the current allocate protocol expects expanded requests which represent
the cumulative request for any change in resource constraints. This is not only very difficult
to comprehend but makes it impossible for the scheduler to associate container allocations
to the original requests. This problem is amplified by the fact that the expansion is managed
by the AMRMClient which makes it cumbersome for non-Java clients as they all have to replicate
the non-trivial logic. In this JIRA, we are proposing a delta allocate protocol where the
AM will need to only specify changes in resource constraints.  



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