MQ advantages and disadvantages (2022.5.2-5.8)

Advantages and disadvantages of message queuing
advantage
That's already been said , system decoupling , Asynchronous call , Traffic peak clipping .
shortcoming
① Reduced system availability ： The more external dependencies the system introduces , The higher the risk the system has to face , Take scene one , Originally ABCD The four systems work well together , No problem , But you have to get one MQ Come in and step in , Although there are many benefits , But in case MQ Hang up. , Then your system will hang up .
② Increased system complexity ： I have to add one MQ Come in , How to ensure that there is no repeated consumption ？ How to handle message loss ？ How to ensure the order of message delivery ？ Too many questions .
③ The question of consistency ：A The system will process it and then transfer it to MQ It returns directly to success , The user thinks your request succeeded , however , If in BCD In the system ,BC The two systems are successfully written to the library ,D What if the system fails to write to the library , This leads to inconsistent data .
therefore . Message queuing is actually a very complex architecture , You're enjoying MQ While bringing benefits , We should also make various technical solutions MQ Solve a series of problems brought by , When it's all done , The complexity of the system has been raised by a level .