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https://issues.apache.org/jira/browse/YARN-947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803743#comment-13803743
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Zhijie Shen commented on YARN-947:
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Thanks for the review. Will file the follow up tickets. As it's ready to go. 
I'll update YARN-956 and YARN-975 accordingly

> Defining the history data classes for the implementation of the 
> reading/writing interface
> -----------------------------------------------------------------------------------------
>
>                 Key: YARN-947
>                 URL: https://issues.apache.org/jira/browse/YARN-947
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>             Fix For: YARN-321
>
>         Attachments: YARN-947.1.patch, YARN-947.2.patch, YARN-947.3.patch, 
> YARN-947.4.patch, YARN-947.5.patch, YARN-947.6.patch, YARN-947.8.patch
>
>
> We need to define the history data classes have the exact fields to be 
> stored. Therefore, all the implementations don't need to have the duplicate 
> logic to exact the required information from RMApp, RMAppAttempt and 
> RMContainer.
> We use protobuf to define these classes, such that they can be ser/des 
> to/from bytes, which are easier for persistence.



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