Yifan Cai created CASSANDRA-19909:
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             Summary: [Analytics] Add writer option COORDINATED_WRITE_CONF to 
define coordinated write to multiple Cassandra clusters
                 Key: CASSANDRA-19909
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19909
             Project: Cassandra
          Issue Type: New Feature
          Components: Analytics Library
            Reporter: Yifan Cai
            Assignee: Yifan Cai


As the first step of implementing coordinated write to multiple Cassandra 
clusters, this patch introduces the new writer option, COORDINATED_WRITE_CONF 
and the optional clusterId to identify clusters. The COORDINATED_WRITE_CONF 
value is a json string that defines the target clusters for the bulk write.

The coordinated write feature requires the exact same table schema (not 
including table properties) across clusters.



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