Redis：计算Redis集群上的特定类别密钥？(Redis: count specific class of keys on a Redis cluster?)

 有没有一种有效的方法来计算Redis集群上的特定类别的密钥？ 
 
 这里，“特定密钥类”是指用于共同目的的密钥; 例如会话密钥。 他们可以有一个公共密钥名称前缀。 可以有多个类。 从现在开始，我将把键类指定为键。 
 
 我想要做的是如下： 
 
 
 
 必须使用Redis群集。 
 
 
 密钥必须分配给Redis集群的节点。 
 
 
 必须有一种有效的方法来计算Redis群集的所有节点上的密钥数。 
 
 
 密钥可以有TTL - 即可以过期。 
 
 
 Redis集群节点的数量可以在运行时更改，散列槽可以重新分配。 
 
 
 客户端使用Node.js实现。 
 
 
 我已阅读文档，但找不到合适的解决方案。 
 
 提前致谢。 

Is there an efficient method to count specific class of keys on a Redis cluster?
 
Here, 'specific class of keys' means the keys that are used for a common purpose; for example, session keys. They can have a common key name prefix. There can be multiple classes. From now, I will refer the class of keys as simply the keys.
 
What I want to do is as follows:
 
 
 
Redis cluster must be used.
 
 
The keys must be distributed to the nodes of the Redis cluster.
 
 
There must be an efficient way to count the number of the keys on all of the nodes of the Redis cluster.
 
 
The keys can have TTL - that is, can expire.
 
 
The number of the nodes of the Redis cluster can be changed on runtime, and hash slots can be redistributed.
 
 
Clients are implemented using Node.js.
 
 
I've read the documentation, but could not find a proper solution.
 
Thanks in advance.

原文：https://stackoverflow.com/questions/47916482