protected int getReportingPeriod() {
      int period = this.perClientRunRows / 10;
      return period == 0 ? this.perClientRunRows : period;
    }
Note that all subclasses of this class must provide a public contructor that has the exact
same list of arguments.
hbase-rest/src/test/java/org/apache/hadoop/hbase/rest/PerformanceEvaluation.java