Shulou(Shulou.com)06/02 Report--

This article mainly introduces "the implementation of Redis distributed lock". In the daily operation, I believe that many people have doubts about the implementation of Redis distributed lock. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "the implementation of Redis distributed lock". Next, please follow the editor to study!

The distributed lock should satisfy the following functions:

Acquisition and release of atomicity

With timeout mechanism

Atomicity of acquisition and release: acquisition failure of atoms may result in multiple services holding locks at the same time.

Timeout mechanism: no timeout mechanism may cause the lock not to be released all the time, for example, the business program hangs after acquiring the lock; after adding the timeout mechanism, there will also be other hidden dangers, such as it does take a long time for the business program to process the business. however, if the timeout time is not set properly, the lock may be occupied at the same time, which requires the business to control itself. Implementation based on Redis:

Using Key-Value structure, the existence of Key is locked, and if it does not exist, it is released.

Get: SET key value PX milliseconds NX

PX: sets the validity period of the value in milliseconds

NX: only if the key does not exist, the setting succeeds, and the existence returns a failure.

The setting of value:value can be a random string, which is described below.

Release: eval "if Redis.call ('get',KEYS [1]) = = ARGV [1] then return redis.call (' del',KEYS [1]) else return 0 end" 1 key randstr

At this point, the study on "the implementation of Redis distributed locks" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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