code: public static void setOutputKeyspace(Configuration conf, String keyspace)
      {
          if (keyspace == null)
              throw new UnsupportedOperationException("keyspace may not be null");
  
          conf.set(OUTPUT_KEYSPACE_CONFIG, keyspace);
      }
docs: Set the keyspace for the output of this job.
  
  @param conf Job configuration you are about to run
  @param keyspace