 <p>I would recommend using Spark for this kind of bulk migration. It's also a useful tool for general maintenance of C*. </p> <p><a href="https://github.com/datastax/spark-cassandra-connector" rel="nofollow">https://github.com/datastax/spark-cassandra-connector</a></p> <p>With spark the command</p> <pre><code>sc.cassandraTable("ks1","table").saveToCassandra("ks2","table") </code></pre> <p>you would move your tables. </p> <p>If you aren't interested in Spark I think a custom java program or Brian Hess's Bulkloader tool would be useful</p> <p><a href="https://github.com/brianmhess/cassandra-loader" rel="nofollow">https://github.com/brianmhess/cassandra-loader</a></p>