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https://issues.apache.org/jira/browse/YARN-4879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Subru Krishnan resolved YARN-4879.
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Resolution: Fixed
Hadoop Flags: Reviewed
Fix Version/s: 3.0.0-beta1
2.9.0
> 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
> Fix For: 2.9.0, 3.0.0-beta1
>
> Attachments: SimpleAllocateProtocolProposal-v1.pdf,
> SimpleAllocateProtocolProposal-v2.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 enhancement to the Allocate Protocol to allow AMs to identify
> requests explicitly.
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