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https://issues.apache.org/jira/browse/CASSANDRA-5797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13717917#comment-13717917
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Jonathan Ellis commented on CASSANDRA-5797:
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Not sure what CQL syntax for this is.  Is it protocol level the way CL is?
                
> DC-local CAS
> ------------
>
>                 Key: CASSANDRA-5797
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5797
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 2.0
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 2.0.1
>
>
> For two-datacenter deployments where the second DC is strictly for disaster 
> failover, it would be useful to restrict CAS to a single DC to avoid cross-DC 
> round trips.
> (This would require manually truncating {{system.paxos}} when failing over.)

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