@Override
        public void run() {
          int offset = Integer.parseInt(getName());
          boolean even = offset % 2 == 0;
          if (even) {
            for (int i = (offset * calls); i < calls; i++) {
              trr.includeTimestamp(i);
            }
          } else {
            int base = offset * calls;
            for (int i = base + calls; i >= base; i--) {
              trr.includeTimestamp(i);
            }
          }
        }
Run a bunch of threads against a single TimeRangeTracker and ensure we arrive at right range.
Here we do ten threads each incrementing over 100k at an offset of the thread index; max is 10
* 10k and min is 0.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestSyncTimeRangeTracker.java