Add CL.ANY_QUORUM to support quorum requests with cross datacenter failover
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Key: CASSANDRA-3172
URL: https://issues.apache.org/jira/browse/CASSANDRA-3172
Project: Cassandra
Issue Type: Improvement
Components: API, Core
Reporter: Mark Guzman
Fix For: 1.1
Currently we provide CL.LOCAL_QUORUM and CL.EACH_QUORUM. CL.ANY_QUORUM would
operate like CL.LOCAL_QUORUM if a local quorum is possible, if it is not the
coordinator would use its knowledge to select the "fastest/closest" node in
another datacenter to attempt another LOCAL_QUORUM in. This would allow for
simple reliable cross datacenter failover without putting the intelligence in
the client. The client is intrinsically at a disadvantage since it doesn't have
a current full picture of the rings.
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