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https://issues.apache.org/jira/browse/HBASE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099821#comment-13099821
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Ted Yu commented on HBASE-2195:
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We were lucky to be able to squeeze version into HLogKey this time (version 0
vs. version -1). My expectation is that we may add more fields beyond UUID
cluster Id.
Exposing getVersion() allows ReplicationSink/ReplicationSource to handle
WALEdit's coming from clusters running different releases of HBase.
E.g. FB may run 0.89 in some clusters and 0.90.x in other clusters.
Michael brought VersionedWritable up @ 04/Sep/11 22:52
I think we should make use of it.
> Support cyclic replication
> --------------------------
>
> Key: HBASE-2195
> URL: https://issues.apache.org/jira/browse/HBASE-2195
> Project: HBase
> Issue Type: Sub-task
> Components: replication
> Reporter: Jean-Daniel Cryans
> Assignee: Lars Hofhansl
> Attachments: 2195-v10.txt, 2195-v12.txt, 2195-v5.txt, 2195-v6.txt,
> 2195.txt
>
>
> We need to support cyclic replication by using the cluster id of each HlogKey
> and stop replicating when it goes back to the original cluster.
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