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https://issues.apache.org/jira/browse/YARN-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832128#comment-13832128
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Jian He commented on YARN-1239:
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Summarize the changes:
- Versioning scheme: major.minor. For e.g. 1.0, 1.1, 1.2...1.25, 2.0 etc.
- Any incompatible change of state-store is a major upgrade, and any
compatible change of state-store is a minor upgrade.
- If theres's no version, treat it as 1.0.
- Within a minor upgrade, say 1.1 to 1.2: overwrite the version info and
proceed as normal.
- Within a major upgrade, say 1.2 to 2.0: throw exception and indicate user
to use a separate upgrade tool to upgrade RM state.
- the version node still coexists with RMAppRoot as a separate node under
StateStoreRoot
> 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-1239.4.patch, YARN-1239.4.patch, YARN-1239.5.patch, YARN-1239.6.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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