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From "Subru Krishnan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-4879) Enhance Allocate Protocol to Identify Requests Explicitly
Date Thu, 14 Apr 2016 01:30:26 GMT

     [ https://issues.apache.org/jira/browse/YARN-4879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Subru Krishnan updated YARN-4879:
    Summary: Enhance Allocate Protocol to Identify Requests Explicitly  (was: Proposal for
a simple (delta) allocate protocol)

> Enhance Allocate Protocol to Identify Requests Explicitly
> ---------------------------------------------------------
>                 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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