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https://issues.apache.org/jira/browse/YARN-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832031#comment-13832031
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Vinod Kumar Vavilapalli commented on YARN-1239:
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Also, please put both a JIRA comment as well as java comments in the code on
the upgrade procedure - it seems like things have changed a lot since my
comment
[here|https://issues.apache.org/jira/browse/YARN-1239?focusedCommentId=13826891&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13826891].
> 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.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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