protected final void stopExecutorService() {
    if (executorService != null) {
      LOG.info("Shutdown executor service");
      executorService.shutdown();
    }
  }
Sets the abort state if not already set.
@return True if abortRequested set to True successfully, false if an abort is already in
        progress.
hbase-server/src/main/java/org/apache/hadoop/hbase/HBaseServerBase.java