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https://issues.apache.org/jira/browse/HADOOP-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12552590
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Bryan Duxbury commented on HADOOP-2394:
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I would say -1 on going back in versions of hbase, because a reverse migration
doesn't readily address how to deal with features and settings not available in
prior versions. You'd have potential for loss of precision per se in terms of
configuration.
Also, I'm not sure why you'd ever want to go from a later version to an
earlier version, unless you've mistakenly upgraded in the first place. I
suggest that you take care and back up your old HDFS files before migrating
instead.
> 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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