redis服务器使用高cpu。

Question

我继承了一个自定义构建的网页，它使用redis服务器，我注意到，每3-5分钟，redis服务器就会达到峰值，并且使用100%的cpu，时间可能是2-3分钟。

有人知道我能做些什么来优化这个问题吗？

Log file:
2276:M 23 Apr 2019 18:22:44.060 * 10 changes in 300 seconds. Saving...
2276:M 23 Apr 2019 18:22:44.356 * Background saving started by pid 16081
16081:C 23 Apr 2019 18:25:03.575 * DB saved on disk
16081:C 23 Apr 2019 18:25:03.783 * RDB: 1 MB of memory used by copy-on-write
2276:M 23 Apr 2019 18:25:04.174 * Background saving terminated with success
2276:M 23 Apr 2019 18:30:05.089 * 10 changes in 300 seconds. Saving...
2276:M 23 Apr 2019 18:30:05.396 * Background saving started by pid 16984
16984:C 23 Apr 2019 18:32:26.841 * DB saved on disk
16984:C 23 Apr 2019 18:32:27.126 * RDB: 1 MB of memory used by copy-on-write
2276:M 23 Apr 2019 18:32:27.523 * Background saving terminated with success
2276:M 23 Apr 2019 18:47:28.032 * 1 changes in 900 seconds. Saving...
2276:M 23 Apr 2019 18:47:28.334 * Background saving started by pid 18748
18748:C 23 Apr 2019 18:49:53.540 * DB saved on disk
18748:C 23 Apr 2019 18:49:53.744 * RDB: 1 MB of memory used by copy-on-write
2276:M 23 Apr 2019 18:49:54.157 * Background saving terminated with success
2276:M 23 Apr 2019 18:54:55.023 * 10 changes in 300 seconds. Saving...
2276:M 23 Apr 2019 18:54:55.328 * Background saving started by pid 19422
19422:C 23 Apr 2019 18:57:18.455 * DB saved on disk
19422:C 23 Apr 2019 18:57:18.592 * RDB: 1 MB of memory used by copy-on-write
2276:M 23 Apr 2019 18:57:18.823 * Background saving terminated with success

Answer 1

雷迪斯就是这样。备份过程涉及到大量的压缩，这将在一段时间内固定一个核。

您可以单独使用AOF (仅追加文件)，但这也需要定期的剪枝和压缩，这只是不太频繁和要求较低。

手册有一些细节，包括这个警告：

有许多用户单独使用AOF，但我们不鼓励使用RDB快照，因为经常使用RDB快照是进行数据库备份、更快重新启动以及在AOF引擎中出现bug的好主意。