Node.js request module getting ETIMEDOUT and ESOCKETTIMEDOUT

Edit: duplicate of https://stackoverflow.com/a/37946324/744276

By default, Node has 4 workers to resolve DNS queries. If your DNS query takes long-ish time, requests will block on the DNS phase, and the symptom is exactly ESOCKETTIMEDOUT or ETIMEDOUT.

Try increasing your uv thread pool size:

export UV_THREADPOOL_SIZE=128
node ...

or in index.js (or wherever your entry point is):

#!/usr/bin/env node
process.env.UV_THREADPOOL_SIZE = 128;

function main() {
   ...
}

Edit 1: I also wrote a blog post about it.

Edit 2: if queries are non-unique, you may want to use a cache, like nscd.