Improve default handling/validation for config.Metadata objects
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                 Key: CASSANDRA-1437
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1437
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Stu Hood
            Priority: Minor
             Fix For: 0.7.0


Post CASSANDRA-1436, we'll be back to single Avro objects to describe schemas 
for client and internal use: it would be a good opportunity to improve our 
handling of defaults and our validation of config.*Metadata objects.

Right now, we have multiple ways to convert a CfDef to a CFMetaData object (for 
example), due to the differences between the defaults that should be chosen for 
a _new_ column family (when we receive the CfDef from a client), versus an 
_existing_ column family after a new setting has been added (deserializing a 
CfDef from disk). Finding a unified way to handle these two (potentially 
different) default values would be excellent.

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