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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-6682) Improve performance of AssignmentInformation datastructures
Date Thu, 01 Jun 2017 21:10:05 GMT
Daryn Sharp created YARN-6682:

             Summary: Improve performance of AssignmentInformation datastructures
                 Key: YARN-6682
                 URL: https://issues.apache.org/jira/browse/YARN-6682
             Project: Hadoop YARN
          Issue Type: Sub-task
    Affects Versions: 2.8.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp

{{AssignmentInformation}} is inefficient and creates lots of garbage that increase gc pressure.
 It creates 3 hashmaps that each contain only 2 enum-based keys. This requires wrapper node
objects, boxing/unboxing of ints, and more expensive lookups than simply using primitive arrays
indexed by enum ordinal.

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