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https://issues.apache.org/jira/browse/HBASE-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279043#comment-13279043
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stack commented on HBASE-6009:
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Lets try and avoid serializing fat ClusterStatus objects twice.
We have never made guarantee that old clients could talk to new servers
pre-0.96 (Too hard in the Writables world). What is the scenario David? You
cannot update the clients? Wouldn't you have to update the clients anyways if
you introduce clusterstatus size? Pardon me if I'm not getting this.
> 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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