private Severity getFilesSeverity(long value) {
    return Severity.getSeverityAscending(value, filesLimits[0], filesLimits[1], filesLimits[2], filesLimits[3]);
  }
This Heuristic analyses the skewness in the task input data
app/com/linkedin/drelephant/tez/heuristics/GenericDataSkewHeuristic.java