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https://issues.apache.org/jira/browse/YARN-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042953#comment-16042953
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Daryn Sharp commented on YARN-6682:
-----------------------------------
This is a simple/self-contained change. Does anyone have time to review?
> 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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