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

How to solve the concurrency problem of redis? In response to this problem, the editor summed up this article today, hoping to help more friends who want to solve this problem to find a more simple and feasible way.

Concurrency problems in redis

Redis has been used as a cache for a long time. Redis runs in the form of a single process, and commands are executed one after another. I always thought that there would be no concurrency problem. I suddenly realized when I saw the relevant information today.

Examples of specific problems

There is a key, suppose the name is myNum, which stores Arabic numerals, suppose the current value is 1, there are multiple connections to operate on myNum, this time there will be concurrency problems. Suppose there are two connections linkA and linkB, both of which do the following, take out the value of myNum, + 1, and then save it back to see the following interaction:

LinkA get myNum = > 1linkB get myNum = > 1linkA set muNum = > 2linkB set myNum = > 2

After the operation, the result may be 2, which is not consistent with our expectation of 3.

Let's look at a specific example:

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