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https://issues.apache.org/jira/browse/HBASE-18626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258368#comment-16258368
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Guanghao Zhang commented on HBASE-18626:
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Ping [~andrew.purt...@gmail.com] [~busbey] for reviewing.
> Handle the incompatible change about the replication TableCFs' config
> ---------------------------------------------------------------------
>
> Key: HBASE-18626
> URL: https://issues.apache.org/jira/browse/HBASE-18626
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0, 1.4.0, 1.5.0, 2.0.0-alpha-3
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Attachments: HBASE-18626.branch-1.001.patch
>
>
> About compatibility, there is one incompatible change about the replication
> TableCFs' config. The old config is a string and it concatenate the list of
> tables and column families in format "table1:cf1,cf2;table2:cfA,cfB" in
> zookeeper for table-cf to replication peer mapping. When parse the config, it
> use ":" to split the string. If table name includes namespace, it will be
> wrong (See HBASE-11386). It is a problem since we support namespace (0.98).
> So HBASE-11393 (and HBASE-16653) changed it to a PB object. When rolling
> update cluster, you need rolling master first. And the master will try to
> translate the string config to a PB object. But there are two problems.
> 1. Permission problem. The replication client can write the zookeeper
> directly. So the znode may have different owner. And master may don't have
> the write permission for the znode. It maybe failed to translate old
> table-cfs string to new PB Object. See HBASE-16938
> 2. We usually keep compatibility between old client and new server. But the
> old replication client may write a string config to znode directly. Then the
> new server can't parse them.
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