@Override
  public String toString() {
    return String.format(
      "%s [base window in milliseconds %d, windows per tier %d, max tier age in milliseconds %d]",
      getClass().getSimpleName(), baseWindowMillis, windowsPerTier, maxTierAgeMillis);
  }
A timestamp t is within the window iff t / size == divPosition.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/ExponentialCompactionWindowFactory.java