node.js - Nodejs 集群未列出

Question

这是从nodejs api复制的:

我想做的是在master中做后台工作，并在worker中接受http请求。

如果我注释掉后台作业部分，效果很好。

const cluster = require('cluster');
const http = require('http');
const numCPUs = require('os').cpus().length;
const sleep = require('sleep');

if (cluster.isMaster) {
  console.log(`Master ${process.pid} is running`);

  // Fork workers.
  for (let i = 0; i < numCPUs; i++) {
    cluster.fork();
  }

  cluster.on('exit', (worker, code, signal) => {
    console.log(`worker ${worker.process.pid} died`);
  });


  // background jobs start
  while(true) {
    console.log(123)
    sleep.sleep(1) // do_background_jobs()
  }
  // background jobs end


} else {
  // Workers can share any TCP connection
  // In this case it is an HTTP server
  http.createServer((req, res) => {
    res.writeHead(200);
    res.end('hello world\n');
  }).listen(8000);

  console.log(`Worker ${process.pid} started`);
}

这是日志:

Master 45476 is running
Worker 45479 started
Worker 45483 started
Worker 45482 started
Worker 45478 started

但是netstat显示8000已关闭。当然 curl 失败了。

Answer 1

您的 while 循环阻塞了“event loop ”，因此主进程中不会发生任何事情。您应该将 while 循环转换为此代码以防止阻塞 IO。

setInterval(() => {
   console.log("123")
}, 1000)