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Posted to yarn-issues@hadoop.apache.org by "Subru Krishnan (JIRA)" <ji...@apache.org> on 2016/03/26 02:35:25 UTC

[jira] [Created] (YARN-4879) Proposal for a simple (delta) allocate protocol

Subru Krishnan created YARN-4879:
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             Summary: 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


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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