大量 sunionstore 怎么提高性能? - V2EX
Te11UA
V2EX    Redis

大量 sunionstore 怎么提高性能?

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  •   Te11UA Feb 6, 2021 1903 views
    This topic created in 1921 days ago, the information mentioned may be changed or developed.
    当前有比较多的 set,每个 set 大约在 500-2000 个,需要频繁地进行 sunionstore 操作,并且需要产生交集的两个集合概率均匀,当 sunionstore 比较多的时候,由于单个 redis 打满了单核 CPU,导致阻塞。

    尝试方案如下:
    1. 集群方案,由于频繁同步,CPU 虽然打满了,但是只能提高一点点性能
    2. 优化代码,不使用 set,但由于业务代码复杂,需要时间改动

    请问有没有更好的方法,能够实现快速“扩容”的效果呢?
    1 replies    2021-02-06 17:21:11 +08:00
    keakon
        1
    keakon  
       Feb 6, 2021
    不知道你的业务场景是怎样的,我弄了 1 万个 set,每个 set 1000 个整数,sunionstore 1 万次不同的 set 也就 200 多 ms 。但是因为修改比较多,会触发 bgsave,可以关闭掉在 slave 去做。

    如果这也是瓶颈的话,在应用层读出来合并再写回去会慢一个数量级。
    不过如果不需要保存 sunionstore 的结果,这样虽然慢,但是可以节省 redis 的 CPU 。
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