More-efficient cross-DC replication
-----------------------------------

                 Key: CASSANDRA-1530
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1530
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Jonathan Ellis
             Fix For: 0.7.1


Currently the coordinator node sends writes to each replica.  In multi-dc 
situations, it would be more efficient to have the coordinator talk to a single 
node in each DC, which would forward the writes to the other replicas local to 
it.  (All replicas would continue to ack to the coordinator.)

Shouldn't be difficult to add a header to RMVH saying "consult the Strategy to 
see who else is local to you and queue it off to them as well."

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