ioredis cluster access to the redis database, in the same second in a number of times out of 80 milliseconds

[zhaozhi1989]

ioredis cluster access to the redis database, in the same second, there are several times out of 80 milliseconds, I would like to ask what is the cause of this.

var Redis = require('ioredis');
var redisClient = {};
redisClient.getRedisClient = function(callback){
var cluster = new Redis.Cluster([
{port:1234,host:'127.0.0.1'},
{port:1235,host:'127.0.0.1'}
],{
redisOptions:{password:'password'}
});
return cluster;
}
module.exports = redisClient;

[luin]

It seems to be a network problem.

是网络原因吧，看你具体的网络环境了

[zhaozhi1989]

Network no problem, the network delay between the nodejs server and the redis server is 2 to 3 ms, just in the same second, the emergence of redis query timeout of 80 milliseconds or more, I would like to ask this and ioredis cluster package is associated with it?

网络没问题，nodejs服务器与redis服务器之间的网络延时是2到3毫秒，只是在同一秒中出现redis查询超时80毫秒以上，请问这与ioredis集群包有关联吗？

[luin]

和 ioredis 无关的，超时原因很多，比如网络 RTT 比较高或者 Redis 线程阻塞。

[zhaozhi1989]

如果根据你说的存在redis线程阻塞，我已经让我们公司DBA查了redis数据库的日志，都没有找到超时50毫秒以上的。

并且我们有用java调用redis集群，都没有存在redis线程阻塞这种情况。

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From: Zihua 子骅
Date: 2016-10-10 23:34
To: luin/ioredis
CC: zhaozhi1989; Author
Subject: Re: [luin/ioredis] ioredis cluster access to the redis database, in the same second in a number of times out of 80 milliseconds (#377)
和 ioredis 无关的，超时原因很多，比如网络 RTT 比较高或者 Redis 线程阻塞。
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[luin]

嗯，排除超时的话就是网络问题或者 Node.js 这边 CPU 阻塞了。把 ioredis 和 java 的代码放到同一个网络环境看看，如果还有问题，确认下是不是 Redis Cluster 返回的数据比较大，JavaScript 的 parser 处理不过来

[zhaozhi1989]

Redis Cluster返回的数据不大，value值都很小，并且parser解析是用的hiredis这个包，
目前nodejs现在用的是单线程，在做压力测试时观看cpu消耗情况，有是会达到100%，
请问cpu过高会造成redis连接超时吗？

另外您那边有没有express.js框架开启多少cluster的例子。

[email protected]

From: Zihua 子骅
Date: 2016-10-10 23:57
To: luin/ioredis
CC: zhaozhi1989; Author
Subject: Re: [luin/ioredis] ioredis cluster access to the redis database, in the same second in a number of times out of 80 milliseconds (#377)
嗯，排除超时的话就是网络问题或者 Node.js 这边 CPU 阻塞了。把 ioredis 和 java 的代码放到同一个网络环境看看，如果还有问题，确认下是不是 Redis Cluster 返回的数据比较大，JavaScript 的 parser 处理不过来
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[luin]

如果 CPU 达到 100% 必然会导致阻塞的

[zhaozhi1989]

目前服务器的配置是4核16G，压力测试的时候是50个并发，有没有什么办法能降低CPU的消耗？

[zhaozhi1989]

子骅，我今天把nodejs开了多线程，cpu降下来了，但是reids查询还是有还多超时，你能分析下是什么原因吗？谢谢！

[email protected]

From: Zihua 子骅
Date: 2016-10-11 00:08
To: luin/ioredis
CC: zhaozhi1989; Author
Subject: Re: [luin/ioredis] ioredis cluster access to the redis database, in the same second in a number of times out of 80 milliseconds (#377)
如果 CPU 达到 100% 必然会导致阻塞的
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