public static CounterName getCounterFromName(String name) {
      if (_counterNameMap.containsKey(name)) {
        return _counterNameMap.get(name);
      }
      return null;
    }
Get the values of all counters in a group
@param groupName
@return A map containing all the values of counters in a group.
app/com/linkedin/drelephant/mapreduce/data/MapReduceCounterData.java