@Override
    public boolean dispatch(CallRunner task) {
      int priority = task.getRpcCall().getPriority();

      if (priority > HConstants.QOS_THRESHOLD) {
        numPriorityCalls++;
      }
      return super.dispatch(task);
    }
Tests whether maximum of masters system time versus RSs local system time is used
hbase-server/src/test/java/org/apache/hadoop/hbase/TestMetaTableAccessor.java