Shulou(Shulou.com)06/01 Report--

This article mainly introduces what the Redis transaction mechanism is, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Do you know the Redis transaction mechanism?

Redis implements the transaction mechanism through MULTI, EXEC, WATCH and other commands. The transaction execution process executes a series of multiple commands sequentially at one time, and during the execution, the transaction will not be interrupted and other requests from the client will not be executed until all the commands have been executed. The execution process of the transaction is as follows:

The server receives the client request, and the transaction starts with MULTI

If the client is in a transactional state, the transaction will be queued and returned to the client QUEUED, otherwise the command will be executed directly

When the client EXEC command is received, the WATCH command monitors whether the key in the entire transaction has been modified. If so, a null reply to the client indicates failure, otherwise the redis will traverse the entire transaction queue, execute all commands saved in the queue, and finally return the result to the client.

The WATCH mechanism itself is a CAS mechanism, and the monitored key will be saved to a linked list. If a key is modified, the REDIS_DIRTY_CAS flag will be opened, and the server will refuse to execute the transaction.

Thank you for reading this article carefully. I hope the article "what is the Redis transaction mechanism" shared by the editor will be helpful to you. At the same time, I also hope that you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.