private synchronized void requestCorePoolDecrease() {
    if (scheduler.getCorePoolSize() > MIN_CORE_POOL_SIZE) {
      scheduler.setCorePoolSize(scheduler.getCorePoolSize() - 1);
      printChoreServiceDetails("requestCorePoolDecrease");
    }
  }
Represents a request to decrease the number of core pool threads. Typically a request
originates from the fact that the current core pool size is more than sufficient to service the
running Chores.
hbase-common/src/main/java/org/apache/hadoop/hbase/ChoreService.java