Tsuyoshi OZAWA commented on YARN-2994:

Thanks Jian for writhing this document.

It is also can be used with FileSysytemStore also right?

This is correct, but it's a bit confusing for users to understand when to use 
FileSystemRMStateStore and when to use ZKRMStateStore. It's better to write 
that "FileSystemRMStateStore can be used only for single node(correctly, single 
process) RM setup" explicitly since there are no fence mechanism in 
FileSystemRMStateStore. What do you think?

> Document work-preserving RM restart
> -----------------------------------
>                 Key: YARN-2994
>                 URL: https://issues.apache.org/jira/browse/YARN-2994
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-2994.1.patch, YARN-2994.2.patch

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