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From "Mark Guzman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3172) Add CL.ANY_QUORUM to support quorum requests with cross datacenter failover
Date Sat, 10 Sep 2011 03:03:10 GMT
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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