redis - redis 的 LPUSH 列表操作接受的最大值是多少？

Question

Redis 提供 LPUSH操作。

LPUSH key value [value ...]

单次操作最多支持多少个值？

Answer 1

关于此:http://redis.io/topics/data-types

The max length of a list is 2^32 - 1 elements (4294967295, more than 4 billion of elements per list).

我打赌你也可以一次使用这么多参数，但你可能会遇到客户端超时的情况。

当您的问题与性能有关时，我想这很适合阅读/了解。

• http://redis.io/topics/mass-insert
• http://redis.io/topics/pipelining
• http://redis.io/topics/latency

更新

tias - bash 明文解析器

22:15 $ echo lpush works {1..1038} | redis-cli 
(integer) 1038
✔ ~ 
22:15 $ echo lpush worksnot {1..1039} | redis-cli 
(integer) 1038
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
(error) ERR unknown command '1039'
✔ ~ 
22:15 $ redis-cli 
127.0.0.1:6379> llen works
(integer) 1038
127.0.0.1:6379> llen worksnot
(integer) 1038
127.0.0.1:6379> llen worksnot

所以看起来限制是 1038。

lua 响应

> args = {'lpush', 'mylist'}
> for n = 1,100000 do
>> table.insert(args, tostring(n))
>> end
> 
> resp = require("resp")
> client = resp.new("127.0.0.1", 6379)
> client:call(unpack(args))
100000
> client:call('llen', 'mylist')
100000

100k 对 lua 没问题。 1m 太多了。 lua(不是 redis!)遇到 stdin:1: too many results to unpack 因为最大堆栈大小(猜测)。

我仍然敢打赌，您可以一次推送列表的最大长度……以防您的环境(编程语言、物理内存大小……)能够处理它。