[jira] [Updated] (YARN-6682) Improve performance of AssignmentInformation datastructures

["Daryn Sharp (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daryn Sharp updated YARN-6682:
------------------------------
    Attachment: YARN-6682.branch-2.8.patch
                YARN-6682.branch-2.patch
                YARN-6682.trunk.patch

Simply uses primitive arrays indexed on ordinal.  Differences between branches is trivial: ex. generics removal, containerId vs rmContainer.

> 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
>         Attachments: YARN-6682.branch-2.8.patch, YARN-6682.branch-2.patch, YARN-6682.trunk.patch
>
>
> {{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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