private Severity getNumTasksSeverity(long numTasks) {
    return Severity.getSeverityAscending(
        numTasks, numTasksLimits[0], numTasksLimits[1], numTasksLimits[2], numTasksLimits[3]);
  }
Analyzes mapper task data spill rates
app/com/linkedin/drelephant/tez/heuristics/MapperSpillHeuristic.java