lwclover commented on issue #4223:
URL: https://github.com/apache/rocketmq/issues/4223#issuecomment-1118073214

   DefaultMQProducer starts as follows:
   DefaultMQProducer.start() -> DefaultMQProducerImpl.start() -> 
DefaultMQProducerImpl.start(true) -> MQClientInstance.start() -> 
DefaultMQProducerImpl.start(false).
   In  DefaultMQProducerImpl.start(false) call 
   
   ```
   this.mQClientFactory.sendHeartbeatToAllBrokerWithLock();
   RequestFutureHolder.getInstance().startScheduledTask(this);
   ```
   DefaultMQProducerImpl.start(true) call again.


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