[GitHub] [rocketmq] mxsm opened a new issue, #4734: DLedgerController.startScheduling implementation has concurrency problems

[GitBox]

mxsm opened a new issue, #4734:
URL: https://github.com/apache/rocketmq/issues/4734

   
![image](https://user-images.githubusercontent.com/15797831/181907798-7bda812a-68f3-4930-b120-081258ffb377.png)
   
![image](https://user-images.githubusercontent.com/15797831/181907805-09af1599-5035-4b4f-abeb-08a9e57de604.png)
   DLedgerController.startScheduling implementation has concurrency problems
   simulation test，for example：
   ```java
   public class Test {
   
       private volatile boolean isScheduling = false;
   
       public static final CyclicBarrier barrier = new CyclicBarrier(200);
   
       public static void main(String[] args) throws Exception{
   
           Test aaa = new Test ();
   
           ExecutorService executorService = Executors.newFixedThreadPool(200);
           for(int i = 0; i < 200; ++i){
               executorService.submit(new Runnable() {
                   @Override
                   public void run() {
                       aaa.startScheduling();
                   }
               });
           }
   
       }
   
   
       public void startScheduling() {
           try {
               barrier.await();
           } catch (InterruptedException e) {
               e.printStackTrace();
           } catch (BrokenBarrierException e) {
               e.printStackTrace();
           }
           if (!this.isScheduling) {
               System.out.println(Thread.currentThread().getName());
               this.isScheduling = true;
           }
       }
   }
   ```
   console print log:
   
![image](https://user-images.githubusercontent.com/15797831/181907976-b246a3ec-ced7-4708-b8fe-c82d6d7b0582.png)
   more than one thread execute if code snippet


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