Bilwa S T commented on YARN-10279:

[~adam.antal] you can take it over

> Avoid unnecessary QueueMappingEntity creations
> ----------------------------------------------
>                 Key: YARN-10279
>                 URL: https://issues.apache.org/jira/browse/YARN-10279
>             Project: Hadoop YARN
>          Issue Type: Task
>            Reporter: Gergely Pollak
>            Assignee: Bilwa S T
>            Priority: Minor
> In CS UserGroupMappingPlacementRule and AppNameMappingPlacementRule classes 
> we create new instances of QueueMappingEntity class. In some cases we simply 
> copy the already received class, so we just duplicate it, which is 
> unnecessary since the class is immutable.
> This is just a minor improvement, probably doesn't have much impact, but 
> still puts some unnecessary load on GC.

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