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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-6682) Improve performance of AssignmentInformation datastructures
Date Thu, 01 Jun 2017 22:13:04 GMT

     [ 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

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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