[jira] Commented: (HBASE-2804) [replication] Support ICVs in a master-master setup

["ryan rawson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883712#action_12883712 ] 

ryan rawson commented on HBASE-2804:
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it would make sense to 'shard' ICV by datacenters, where each datacenter gets it's own ICV column then anyone wishing to know the total would just get all columns and sum.  Different datacenters would not overwrite each other.  The only problem is this is more of an application level thing, and isnt baked into the API anywhere setting people up for failure down the road.

The problem with doing something like shipping deltas is that it becomes difficult to bring up a new cluster, since the cluster will need a 'starting point' combined with a sequence of deltas that must mesh perfectly or else the replica cluster will be out of sync.

> [replication] Support ICVs in a master-master setup
> ---------------------------------------------------
>
>                 Key: HBASE-2804
>                 URL: https://issues.apache.org/jira/browse/HBASE-2804
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.21.0
>
>
> Currently an ICV ends up as a Put in the HLogs, which ReplicationSource ships to ReplicationSink that in turn only recreates the Put and not the ICV itself. This means that in a master-master replication setup where the same counters are implemented on both side, the Puts will actually overwrite each other.
> We need to find a way to support this use case.

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