Christopher Hughes created FLINK-8655:

             Summary: Add a default keyspace to CassandraSink
                 Key: FLINK-8655
             Project: Flink
          Issue Type: Improvement
    Affects Versions: 1.4.0
            Reporter: Christopher Hughes
             Fix For: 1.4.1

Currently, to use the CassandraPojoSink, it is necessary for a user to provide 
keyspace information on the desired POJOs using datastax annotations.  This 
allows various POJOs to be written to multiple keyspaces while sinking 
messages, but prevent runtime flexibility.

For many developers, non-production environments may all share a single 
Cassandra instance differentiated by keyspace names.  I propose adding a 
`defaultKeyspace(String keyspace)` to the ClusterBuilder.  POJOs that lack a 
keyspace would be piped to the default. 

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