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https://issues.apache.org/jira/browse/YARN-10371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17185158#comment-17185158
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Peter Bacsko commented on YARN-10371:
-------------------------------------

Another thing: this and the remaining changes will introduce new code in 
"org.apache.hadoop.yarn.server.resourcemanager.placement". There are already 
FS-related placement stuff there. The new placement engine is not entirely 
scheduler agnostic, I think it deserves its own package.

> Create variable context class for CS queue mapping rules
> --------------------------------------------------------
>
>                 Key: YARN-10371
>                 URL: https://issues.apache.org/jira/browse/YARN-10371
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Gergely Pollak
>            Assignee: Gergely Pollak
>            Priority: Major
>         Attachments: YARN-10371.001.patch
>
>
> As per the design document attached to the umbrella Jira (YARN-10370), we 
> need a class which is responsible for storing all the variables usable in 
> mapping rules. This class shall be able to store mutable / immutable 
> variables, and replace the known variables in a provided string.



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