当达到maxSockets时，node.js会发生什么？ [英] node.js what happens when maxSockets are reached?

问题描述

我想知道到达 maxSockets 时会发生什么？

I was wondering what happens when maxSockets is reached?

如果我使用的服务允许我创建自定义 http.Agent 并指定 maxSockets 到1。当我尝试发出多个并发请求时会发生什么？

If I'm using a service that allows me to create a custom http.Agent and I specify maxSockets to 1. What happens when I try to issues multiple concurrent requests?

每个请求都将超出初始块，直到初始完成？然后套接字将可用于下一个请求？和其他所有阻止？我当然会这么认为，但是无法在文档中找到任何东西，并且对套接字编程是全新的。

Will each request beyond the initial block until the initial is complete?? Then the socket would become available to the next request? and all others block? I would certainly assume so, but was not able to find anything in the docs specifically, and am brand new to socket programming.

推荐答案

使用maxSockets后，其他请求会排队直到活动的请求完成并且释放了套接字以供使用，这时来自队列的挂起请求将在新释放的套接字上发送。

After maxSockets are in use, additional requests get queued until an active request completes and a socket is freed up to be used, at which point a pending request from the queue would be sent on the newly-freed socket.

注意从技术上讲，这并不是在排队-在此过程中，CPU和事件循环会继续做有用的工作。

Note this is technically queueing not blocking - the CPU and event loop continue to do useful work during this process.

请注意，每个域上还有一个maxSockets和队列（ 主机：端口）（类似于浏览器）。

Note also there is a maxSockets and queue on a per-origin ("host:port") basis (similar to browsers).

还请注意，默认maxSockets为Infinity 。

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