private void setException(String rawLog) {
    Matcher mrJobExceptionMatcher = _mrJobExceptionPattern.matcher(rawLog);
    if (mrJobExceptionMatcher.find()) {
      this._exception = new LoggingEvent(mrJobExceptionMatcher.group());
    }
  }
Given MR Job log, finds the MR Job level exception and sets it equal to _exception
@param rawLog MR Job log in a string
app/com/linkedin/drelephant/exceptions/MRJobLogAnalyzer.java