@Override
      public void remove() {
        if (iterator != null) {
          iterator.remove();
        }
      }
Gets an iterator to use to access the records in the data file.
<p/>
Each item is a Map of column names to values.

@return an Iterator of records from the data file, each record is represented as a Map of
column name (String) to column value (String)
ambari-server/src/main/java/org/apache/ambari/server/serveraction/kerberos/AbstractKerberosDataFileReader.java