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Zhihong Yu commented on HBASE-6009: ----------------------------------- HBASE-5209 is an improvement. Backing it out wouldn't be too bad. > 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira