木偶操纵者cluster.close()在调用cluster.queue()后“崩溃”

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

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`);
  });

  // 关闭集群的正确方法
  process.on('SIGINT', () => {
    console.log('Closing cluster...');
    cluster.disconnect(() => {
      console.log('All workers disconnected');
      process.exit(0);
    });
  });
} 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`);

  // 监听关闭信号
  process.on('message', (msg) => {
    if (msg === 'shutdown') {
      console.log(`Worker ${process.pid} shutting down...`);
      process.exit(0);
    }
  });
}