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https://issues.apache.org/jira/browse/HADOOP-2394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12560204#action_12560204
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stack commented on HADOOP-2394:
-------------------------------

Chatting w/ Jim, we need to work out a design for how we see migrations working 
going forward.  I made a start here 
http://wiki.apache.org/hadoop/Hbase/Migration.

> 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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