code: public static void setInputColumnFamily(Configuration conf, String keyspace, String columnFamily, boolean widerows)
      {
          if (keyspace == null)
              throw new UnsupportedOperationException("keyspace may not be null");
  
          if (columnFamily == null)
              throw new UnsupportedOperationException("columnfamily may not be null");
  
          conf.set(INPUT_KEYSPACE_CONFIG, keyspace);
          conf.set(INPUT_COLUMNFAMILY_CONFIG, columnFamily);
          conf.set(INPUT_WIDEROWS_CONFIG, String.valueOf(widerows));
      }
docs: Set the keyspace and column family for the input of this job.
  
  @param conf         Job configuration you are about to run
  @param keyspace
  @param columnFamily
  @param widerows