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https://issues.apache.org/jira/browse/HBASE-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279093#comment-13279093
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David S. Wang commented on HBASE-6009:
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I wouldn't back it out ... I think that would just create another
incompatibility event between 0.92.1 and 0.92.2.
The original goal was to get this committed for 0.92.0 (which would have
avoided this), but I suppose we didn't make it for 0.92.0. I should have said
something about not doing this once 0.92.0 came out, so my apologies on that.
> Changes for HBASE-5209 are technically incompatible
> ---------------------------------------------------
>
> Key: HBASE-6009
> URL: https://issues.apache.org/jira/browse/HBASE-6009
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.92.1, 0.94.0
> Reporter: David S. Wang
>
> The additions to add backup masters to ClusterStatus are technically
> incompatible between clients and servers. Older clients will basically not
> read the extra bits that the newer server pushes for the backup masters, thus
> screwing up the serialization for the next blob in the pipe.
> For the Writable, we can add a total size field for ClusterStatus at the
> beginning, or we can have start and end markers. I can make a patch for
> either approach; interested in whatever folks have to suggest. Would be good
> to get this in soon to limit the damage to 0.92.1 (don't know if we can get
> this in in time for 0.94.0).
> Either change will make us forward-compatible starting with when the change
> goes in, but will not fix the backwards incompatibility, which we will have
> to mark with a release note as there have already been releases with this
> change.
> Hopefully we can do this in a cleaner way when wire compat rolls around in
> 0.96.
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