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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2195) Support cyclic replication
Date Thu, 08 Sep 2011 05:55:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100091#comment-13100091
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Lars Hofhansl commented on HBASE-2195:
--------------------------------------

Not true Ted. There is no implicit version assumption.
The assumption is that we can get a cluster UUID from HLogKey, and if no UUID was set we get
a reference to DEFAULT_CLUSTER_ID, which is true for any version of the WAL file format, precisely
because we kept all the versioning inside of HLogKey.

The new code can read the old file. Of course you cannot mix the new ReplicationSource code
with the old HLogKey code, but that is not the goal of versioning here.


> 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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