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https://issues.apache.org/jira/browse/HBASE-7647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562158#comment-13562158
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Elliott Clark commented on HBASE-7647:
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TestMasterObserver passed 10x locally on my box.
> 0.94 hfiles v2.1 are not backwards compatible with HFilev2.0
> ------------------------------------------------------------
>
> Key: HBASE-7647
> URL: https://issues.apache.org/jira/browse/HBASE-7647
> Project: HBase
> Issue Type: Bug
> Components: HFile
> Affects Versions: 0.94.4
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Fix For: 0.94.5
>
> Attachments: HBASE-7647-2.patch
>
>
> When doing a rolling re-start from 0.92.x to 0.94.x any hfiles written by
> 0.94 are incompatibile with any of the 0.92 region servers. This is caused
> by the checksums being put into 0.94.
> * a minor version was added
> * checksums were put into the block
> * checksum meta data was added to block headers.
> I propose that since these changes are only needed if using
> hbase.regionserver.checksum.verify, they should be turned off if that option
> is turned off. Doing so will allow rolling upgrades to go smoother.
> If a user wants to go from a 0.92 cluster to a 0.94 cluster with
> hbase.regionserver.checksum.verify they can:
> * Roll out 0.94
> * Change hbase-site.xml
> * roll restart the region servers.
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