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This article mainly introduces how to use lazy deletion Lazy free in Redis, which 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.

Use laziness to delete Lazy free

When key expires or when the DEL delete command is used, Redis frees up the memory allocated by the object in addition to removing the object from the global hash table. When big key is encountered, freeing memory will cause the main thread to block.

To this end, Redis 4.0 introduces the UNLINK command, which frees the object memory operation into the bio background thread to execute. So as to effectively reduce the blocking of the main thread.

Redis 6. 0 goes a step further by introducing Lazy-free-related configurations. When the configuration is enabled, the "release object" operation is "executed asynchronously" within the key expiration and DEL commands.

Void delCommand (client * c) {delGenericCommand (CPE server.lazyfreeways lazyhands usernames);} void delGenericCommand (client * c, int lazy) {int numdel = 0, j; for (j = 1; j)

Argc; jacks +) {expireIfNeeded (c-> db,c- > argv [j]); / / enable lazy free to delete int deleted = lazy asynchronously? DbAsyncDelete (c-> db,c- > argv [j]): dbSyncDelete (c-> db,c- > argv [j]);...}}

It is recommended that you upgrade to at least Redis 6 and turn on Lazy-free.

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