与 MongoDB 服务器的连接数 [英] Number of connections to MongoDB server

问题描述

我使用 db.serverStatus().connections 检查到我的 MongoDB 服务器的连接数并得到以下结果:

I checked number of connections to my MongoDB server using db.serverStatus().connections and got this result:

matrix:PRIMARY> db.serverStatus().connections
{
        "current" : 45,
        "available" : 51155,
        "totalCreated" : NumberLong(1886475)
}

但是，当我尝试按照这个答案检查连接了哪些客户端时，我得到了这个结果:

However when I tried to check which clients are connected by following this answer, I got this result:

$ sudo lsof | grep mongod | grep TCP | wc -l
5390

以上哪一个是正确的，为什么两个输出有巨大差异?

Which one of the above is correct and why is there a huge difference in the two outputs?

推荐答案

这只是 lsof 输出的问题.lsof 在输出中包含文件的偏移量:https://unix.stackexchange.com/questions/60422/how-to-interpret-this-output-of-lsof-command.因此，输出中的同一连接有多个条目.一旦我删除它，来自 lsof 的客户端数量与 db.serverStatus().connections 报告的相同.

This was just a problem with the lsof output. lsof includes the offset of the file in the output: https://unix.stackexchange.com/questions/60422/how-to-interpret-this-output-of-lsof-command. So there are multiple entries for the same connection in the output. Once I removed that, number of clients from lsof was same as that reported by db.serverStatus().connections.

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