Junping Du commented on YARN-667:

Thanks for your comments, [~zjshen]! 
bq. Shall we consider the version of history data as well?
That's good point. We should consider history data, like: 
ApplicationHistoryData, ApplicationAttemptHistoryData, ContainerHistoryData, 
etc. could be variable in future and make them proper versioned. In addition, 
any changes on format (i.e. APPLICATION_PREFIX, etc.) and path of history file 
(root+appID for now) could be very challenge on rolling upgrade (also seen as 
incompatible change I think). [~zjshen], do you have sense on how possibility 
it could happen in 2.X as you are currently work on ATS?

> Data persisted in RM should be versioned
> ----------------------------------------
>                 Key: YARN-667
>                 URL: https://issues.apache.org/jira/browse/YARN-667
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.0.4-alpha
>            Reporter: Siddharth Seth
>            Assignee: Junping Du
> Includes data persisted for RM restart, NodeManager directory structure and 
> the Aggregated Log Format.

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