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https://issues.apache.org/jira/browse/YARN-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13828225#comment-13828225
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Jian He commented on YARN-1239:
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Discussed with Vinod offline, in the scope of this jira, we can just check
whether this is a compatible state. If it is compatible, RM can load it and
proceed as normal.
In case of incompatible, throw exception and indicate user to upgrade the state
with a separate tool to do things like rearranging the directory structure or
renaming the fields back, etc. For that, each incompatible implementation needs
to write their own version parser for parsing and loading the data.
> Save version information in the state store
> -------------------------------------------
>
> Key: YARN-1239
> URL: https://issues.apache.org/jira/browse/YARN-1239
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Bikas Saha
> Assignee: Jian He
> Attachments: YARN-1239.1.patch, YARN-1239.2.patch, YARN-1239.3.patch,
> YARN-1239.patch
>
>
> When creating root dir for the first time we should write version 1. If root
> dir exists then we should check that the version in the state store matches
> the version from config.
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