code: public final void shutdownNow() {
  
        if(isShuttingDown.compareAndSet(false, true)) {
  
           logInfo("Shutting down...");
  
           if(idleSegmentMonitorService != null) {
              logInfo("Shutting down idle segment monitor service...");
              idleSegmentMonitorService.shutdownNow();
           }
  
           if(segmentSignalQueue != null) {
              segmentSignalQueue.clear();
           }
  
           if(segmentSignalMonitorThread != null) {
              logInfo("Shutting down segment signal monitor thread...");
              segmentSignalMonitorThread.interrupt();
           }
  
           logInfo("Shutting down all segments...");
           for(ConnectionPoolSegment segment : segments) {
              segment.shutdownNow();
           }
  
           logInfo("Shutting down inactive monitor service...");
           inactiveMonitorService.shutdownNow();
  
           Clock.shutdown();
  
           logInfo("Shutdown complete!");
        }
     }
docs: Shutdown the pool without waiting for any in-progress
  operations to complete.