Question

您好我想学习节点js中的多线程。我现在正在学习，但我在节点js中遇到了一些麻烦。我在下面找到了这些代码。当我想转到http://localhost/plumber地址时，为什么这些代码会出错？感谢...

var cluster = require('cluster');
var numCPUs = require('os').cpus().length;
var http = require('http');

if (cluster.isMaster) {
    console.log (' Fork %s worker(s) from master', numCPUs);
    for (var i = 0; i < numCPUs; i++) {
        cluster.fork();
    }
    cluster.on('online', function(worker) {
        console.log ('worker is running on %s pid', worker.process.pid);
    });
    cluster.on('exit', function(worker, code, signal) {
        console.log('worker with %s is closed', worker.process.pid);
    });
} else if (cluster.isWorker) {
    var port = 3000;
    console.log('worker (%s) is now listening to http://localhost:%s',
        cluster.worker.process.pid, port);
    http.createServer(function (req, res) {
        res.writeHead(200, {'Content-Type': 'text/html'});
        console.log(req.url+cluster.worker.process.pid);
        if(req.url=='/plumber'){
            sleep(10);
            res.end('no write because of error but answer requests');
        }else {
            res.end('cluster' + cluster.worker.process.pid + 'answered');
        }
    }).listen(port,"127.0.0.1");

}

Answer 1

首先，如果它不是默认值（80），您需要在网址中指定端口：

http://localhost:3000/plumber

其次，sleep不是一个功能;并且很可能它永远不会是您想要的方式，因为node.js在设计上是非阻塞的。您可能希望使用类似setTimeout的内容。

为什么这是节点js集群中的错误

1 个答案: