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https://issues.apache.org/jira/browse/HBASE-2195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13098457#comment-13098457
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[email protected] commented on HBASE-2195:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/1730/
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(Updated 2011-09-06 23:16:48.646105)
Review request for hbase, Ted Yu, Michael Stack, and Jean-Daniel Cryans.
Summary
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For Master <-> Master replication (as well as cycles > 2) a replication sink
needs to keep track who is was the originator of a change and
(1) do not replicate this data back to the originator and
(2) pass that information on to the next link in a cycle > 2
In order to do that, HlogKeys read from the WAL are tagged with the Cluster
UUID at the ReplicationSource before the logs are shipped to the Sink. The sink
writes the Cluster UUID into the WAL log (in HlogKey, so only once per edit).
If the sink is also source for yet another sink the ClusterUUID is retained in
the HLogKeys read from the local WAL and passed on to the sink.
This addresses bug HBASE-2195.
https://issues.apache.org/jira/browse/HBASE-2195
Diffs
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http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSink.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/HConstants.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/Delete.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/Put.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLog.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogKey.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/replication/ReplicationZookeeper.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java
1165864
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/replication/TestMasterReplication.java
PRE-CREATION
Diff: https://reviews.apache.org/r/1730/diff
Testing (updated)
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All tests pass.
New test: TestMasterReplication (which tests Master <-> Master, but no cycles >
2, yet), also passes.
Manually tested a cycle between 3 clusters.
Thanks,
Lars
> 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-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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