@Override
    public void close(TaskAttemptContext context) throws IOException {
      for (BufferedMutator mutator : mutatorMap.values()) {
        mutator.close();
      }
      if (connection != null) {
        connection.close();
      }
    }
the name of the table, as a string
@return the named mutator if there is a problem opening a table
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/MultiTableOutputFormat.java