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https://issues.apache.org/jira/browse/HADOOP-2668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560748#action_12560748
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Jim Kellerman commented on HADOOP-2668:
---------------------------------------

If you run the migrate tool as the exception suggested, it will write the 
version file and then the system will start.

> [hbase] After 2643, cluster won't start if FS was created by an older hbase 
> version
> -----------------------------------------------------------------------------------
>
>                 Key: HADOOP-2668
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2668
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>            Reporter: stack
>            Priority: Blocker
>             Fix For: 0.16.0
>
>         Attachments: migrate.patch
>
>
> Hbase now checks for a version file.  If none, it reports a version mismatch. 
>  There will be no version file if the hbase was made by a version older than 
> r613469

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