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https://issues.apache.org/jira/browse/YARN-7988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383976#comment-16383976
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Bibin A Chundatt commented on YARN-7988:
----------------------------------------

Thank you [~Naganarasimha] for review

Adding summary of implementation. 

*FSNodeMirrorOpType*,*FSNodeMirrorOpType*
Defines all mapping of operation for Mirror file and edit file respectively
*FSNodeStoreLogOp*,*FSNodeStoreLogOp*
Defines all operations that will be written to edit and mirror file 
respectively. Attribute level operation also will be defined in same file.

AbstractFSNodeStore is abstract class for all filesystem based implementation. 
Attribute store also will be extending the same.

I have handled all comments based on offline discussion. Attaching updated 
patch 

> Refactor FSNodeLabelStore code for attributes store support
> -----------------------------------------------------------
>
>                 Key: YARN-7988
>                 URL: https://issues.apache.org/jira/browse/YARN-7988
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Bibin A Chundatt
>            Assignee: Bibin A Chundatt
>            Priority: Major
>         Attachments: YARN-7988-YARN-3409.002.patch, YARN-7988.001.patch
>
>
> # Abstract out file FileSystemStore operation
> # Define EditLog Operartions  and Mirror operation
> # Support compatibility with old nodelabel store



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