code: @SuppressWarnings("unchecked")
      public CassandraJavaPairRDD<K, V> perPartitionLimit(Long rowsNumber) {
          CassandraRDD<Tuple2<K, V>> newRDD = rdd().perPartitionLimit(rowsNumber);
          return wrap(newRDD);
      }
docs: Adds the PER PARTITION LIMIT clause to CQL select statement. The limit will be applied for each
  Cassandra Partition