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https://issues.apache.org/jira/browse/HBASE-9801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799350#comment-13799350
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Enis Soztutar commented on HBASE-9801:
--------------------------------------

In a rolling upgrade scenario, you cannot have newer code writing new file 
format, since a failure can lead to the old servers not being able to re-open 
the regions. If 0.98 comes support with v3 though, we probably can default in 
the release after 98. 

> Change the default HFile version to V3
> --------------------------------------
>
>                 Key: HBASE-9801
>                 URL: https://issues.apache.org/jira/browse/HBASE-9801
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Anoop Sam John
>            Priority: Critical
>




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