[jira] [Created] (CASSANDRA-12774) Expose dc in Unavailable exception errors

["Andy Tolbert (JIRA)" <ji...@apache.org>]

Andy Tolbert created CASSANDRA-12774:
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             Summary: Expose dc in Unavailable exception errors
                 Key: CASSANDRA-12774
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12774
             Project: Cassandra
          Issue Type: Bug
            Reporter: Andy Tolbert
            Priority: Minor


For protocol v5 or later, it could be useful if Unavailable optionally included the DC that could not meet the CL.  

For example. if a user has a keyspace with RF of { dc1: 3, and dc2: 3 } and they make a query at {{EACH_QUORUM}} and not enough replicas are available in dc2, an {{UnavailableException}} will be sent to the client with X available and 2 required, but we don't know which DC failed.  It looks like {{UnavailableException}} already has a constructor that takes in the DC (see [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/exceptions/UnavailableException.java#L33]) so this could be feasible.



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