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https://issues.apache.org/jira/browse/HBASE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13099757#comment-13099757
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stack commented on HBASE-2195:
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You think we should expose this version Ted?  I'd think it an internal 
implementation detail.   Hopefully, the case should be that the clients never 
have to worry what version their HLogKey is.  It always just works whatever 
data format is thrown at it because internally it'll do the right thing 
instantiating an HLogKey though given version 0 or version 1 data.  It seems 
like HLogKey does what VersionedWritable adds (but for the getVersion method)

> 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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