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https://issues.apache.org/jira/browse/HADOOP-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558037#action_12558037
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Jim Kellerman commented on HADOOP-2394:
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stack wrote:
> I ain't too invested in our supporting reverse migrations but its worth
> noting that any migration system worth its salt -
> systems I've worked on in the past and ruby on rails - go both ways if only
> to facilitate testing of the forward migration
> (inevitably there's a bug when you try to migrate real data).
That's what backups are for :)
More importantly though, HADOOP-2478 incorporates a migration tool. The
specifics of what the tool does will have to be
rewritten for each upgrade, but I think the framework is good.
> Add supprt for migrating between hbase versions
> -----------------------------------------------
>
> Key: HADOOP-2394
> URL: https://issues.apache.org/jira/browse/HADOOP-2394
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: Johan Oskarsson
>
> If Hbase is to be used to serve data to live systems we would need a way to
> upgrade both the underlying hadoop installation and hbase to newer versions
> with minimal downtime.
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