public void forceShutDown() {
    timedShutDownLatch.countDown();
    try {
      shutDownLatch.await();
    } catch (Exception e) {
      logger.error("Error while waiting gor shutdown latch", e);
    }
  }
forces the {@link #getTimedShutDownThread()} to wake up and
start the shutdown, waits until the shutdown is complete
ambry-tools/src/main/java/com/github/ambry/tools/perf/serverperf/ServerPerformance.java