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https://issues.apache.org/jira/browse/HBASE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096993#comment-13096993
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Lars Hofhansl commented on HBASE-2195:
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True true. Those would be *very* old logs from before replication was added,
though.
If we break compatibility, how are we going to make sure that there no old logs
to read when a user upgrades to 0.92? In this case we will guarantee that old
logs cannot be read any longer.
In addition there would be no way to check whether a log is old, as the first
byte can be anything.
> 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
> Attachments: 2195-v5.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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