Tsuyoshi OZAWA commented on YARN-556:

If we can break the compatibility about the container id, I think Anubhav's 
approach has no problem.
If we cannot do this as [~jianhe] mentioned on YARN-2001, I think epoch idea 
 might be used.

> RM Restart phase 2 - Work preserving restart
> --------------------------------------------
>                 Key: YARN-556
>                 URL: https://issues.apache.org/jira/browse/YARN-556
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: resourcemanager
>            Reporter: Bikas Saha
>            Assignee: Bikas Saha
>         Attachments: Work Preserving RM Restart.pdf, 
> WorkPreservingRestartPrototype.001.patch
> YARN-128 covered storing the state needed for the RM to recover critical 
> information. This umbrella jira will track changes needed to recover the 
> running state of the cluster so that work can be preserved across RM restarts.

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