Analysis of distributed transaction TCC

Preface

I have learned about distributed transactions before , Yes 2PC、3PC agreement .

TCC It is also a way to implement distributed transactions / agreement , Alibaba open source seata Distributed transaction middleware supports TCC Pattern .

TCC Introduce

TCC refer to Try - Confirm - Cancel.

• Try It's reserved , That is, reservation and locking of resources , Attention is reserved .
• Confirm It refers to confirming the operation , This step is actually the actual implementation .
• Cancel It refers to the undo operation , It can be understood as canceling the action of the reservation stage .
  In fact, from the point of view of thought and 2PC almost , It's all trial and exploratory execution , If it's all right, then actually implement it , If not, roll back .

Be careful

It is worth noting that ,TCC The three board axe method in requires the business party to implement its own logic , It's hard .

Realization TCC When it's logical , We need to pay attention to Idempotent support , Because in Confirm and Cancel Retry may occur when .