关联的GitHub问题：https://github.com/sgentle/phantomjs-node/issues/280
我有一个简单的应用程序执行以下操作：
var
phantom = require('phantom'),
express = require('express'),
serve = express();
serve.get('/foo', function (req, res) {
try {
phantom.create(function (ph) {
console.log('Phantom browser created w/ pid: ', ph.process.pid);
ph.onError = function (msg, trace) {
var msgStack = ['PHANTOM ERROR: ' + msg];
if (trace && trace.length) {
msgStack.push('TRACE:');
trace.forEach(function (t) {
msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function + ')' : ''));
});
}
console.log(msgStack.join('\n'));
};
ph.createPage(function(page){
page.open('http://www.stackoverflow.com', function(status){
res.json({pageStatus: status});
page.close();
ph.exit();
});
});
});
} catch(e){
console.log(e);
throw e;
}
});
只要我在WebStorm中运行它，它运行得很好，我可以按照我想要的那样点击/foo端点w /尽可能多的并发请求。一切都按预期工作。
但是一旦我尝试在PM2 w / pm2 start -i 0 phantomapp.js后面进行扩展，只要我没有向它发出太多请求，一切仍然可以正常工作。第二个我打开两个浏览器窗口并在两者中点击刷新，我在pm2 logs中得到以下内容。此时，PM2管理的所有8个进程都“消失”了！我究竟做错了什么？？ ：
PM2: 2015-05-27 18:53:17: [PM2] Error caught by domain:
PM2: AssertionError: false == true
PM2: at RoundRobinHandle.add (cluster.js:140:3)
PM2: at queryServer (cluster.js:480:12)
PM2: at Worker.onmessage (cluster.js:438:7)
PM2: at ChildProcess.<anonymous> (cluster.js:692:8)
PM2: at ChildProcess.emit (events.js:129:20)
PM2: at handleMessage (child_process.js:324:10)
PM2: at Pipe.channel.onread (child_process.js:352:11)
PM2: 2015-05-27 18:53:18: [PM2] Automatic `pm2 update` failed. Killing PM2 daemon and its processes...
PM2: 2015-05-27 18:53:18: pm2 has been killed by signal, dumping process list before exit...
PM2: 2015-05-27 18:53:18: Stopping app:phantomapp id:0
PM2: assert.js:86
PM2: throw new assert.AssertionError({
PM2: ^
PM2: AssertionError: false == true
PM2: at RoundRobinHandle.add (cluster.js:140:3)
PM2: at queryServer (cluster.js:480:12)
PM2: at Worker.onmessage (cluster.js:438:7)
PM2: at ChildProcess.<anonymous> (cluster.js:692:8)
PM2: at ChildProcess.emit (events.js:129:20)
PM2: at handleMessage (child_process.js:324:10)
PM2: at Pipe.channel.onread (child_process.js:352:11)
phantomapp-0 (err): Process disconnected from parent !
PM2: [PM2] Spawning PM2 daemon
PM2: 2015-05-27 18:53:18: [PM2][WORKER] Started with refreshing interval: 30000
PM2: 2015-05-27 18:53:18: [[[[ PM2/God daemon launched ]]]]
PM2: 2015-05-27 18:53:18: BUS system [READY] on port /Users/matthewmarcus/.pm2/pub.sock
PM2: 2015-05-27 18:53:18: RPC interface [READY] on port /Users/matthewmarcus/.pm2/rpc.sock
PM2: [PM2] PM2 Successfully daemonized
PM2: Be sure to have the latest version by doing `npm install pm2@latest -g` before doing this procedure.
PM2: [PM2] Stopping PM2...
PM2: [PM2][WARN] No process found
PM2: [PM2] All processes have been stopped and deleted
PM2: 2015-05-27 18:53:18: PM2 is being killed via kill method
PM2: 2015-05-27 18:53:18: RPC socket closed
PM2: 2015-05-27 18:53:18: PUB socket closed
PM2: [PM2] PM2 stopped
PM2: 2015-05-27 18:53:19: [PM2][WORKER] Started with refreshing interval: 30000
PM2: 2015-05-27 18:53:19: [[[[ PM2/God daemon launched ]]]]
PM2: 2015-05-27 18:53:19: BUS system [READY] on port /Users/matthewmarcus/.pm2/pub.sock
PM2: 2015-05-27 18:53:19: RPC interface [READY] on port /Users/matthewmarcus/.pm2/rpc.sock
PM2: >>>>>>>>>> PM2 updated
PM2: ┌──────────┬────┬──────┬─────┬────────┬─────────┬────────┬────────┬──────────┐
PM2: │ App name │ id │ mode │ pid │ status │ restart │ uptime │ memory │ watching │
PM2: └──────────┴────┴──────┴─────┴────────┴─────────┴────────┴────────┴──────────┘
PM2: Use `pm2 show <id|name>` to get more details about an app
您可以使用节点本机群集重现相同的问题：
var cluster = require('cluster');
if(cluster.isMaster){
var cpuCount = require('os').cpus().length;
for (var i = 0; i < cpuCount; i++){
cluster.fork();
}
cluster.on('exit', function(worker){
console.log('Worker ' + woker.id + ' died. Forking...');
cluster.fork();
});
} else {
var
phantom = require('phantom'),
express = require('express'),
serve = express();
serve.get('/foo', function (req, res) {
try {
phantom.create(function (ph) {
console.log('Phantom browser created w/ pid: ', ph.process.pid);
ph.onError = function (msg, trace) {
var msgStack = ['PHANTOM ERROR: ' + msg];
if (trace && trace.length) {
msgStack.push('TRACE:');
trace.forEach(function (t) {
msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function + ')' : ''));
});
}
console.log(msgStack.join('\n'));
};
ph.createPage(function(page){
page.open('http://www.stackoverflow.com', function(status){
res.json({pageStatus: status});
page.close();
ph.exit();
});
});
});
} catch(e){
console.log(e);
throw e;
}
});
}
在尝试处理＆gt;时，控制台中会产生以下错误：同时请求1个：
assert.js:86
throw new assert.AssertionError({
^
AssertionError: false == true
at RoundRobinHandle.add (cluster.js:140:3)
at queryServer (cluster.js:480:12)
at Worker.onmessage (cluster.js:438:7)
at ChildProcess.<anonymous> (cluster.js:692:8)
at ChildProcess.emit (events.js:129:20)
at handleMessage (child_process.js:324:10)
at Pipe.channel.onread (child_process.js:352:11)
答案 0 :(得分：0)
我尝试使用this gist，我可以创建幻像浏览器并获得响应。
localhost:3000/foo上运行两个标签，则只有在第一个标签结束时才会生成第二个标签。如果我从bash脚本运行请求（小于或等于群集的数量），它根本不会崩溃。
另外，我注意到使用bash脚本我会同时运行所有内容：
http GET localhost:3000/foo &
http GET localhost:3000/foo &
http GET localhost:3000/foo &
http GET localhost:3000/foo &
您看到的错误来自this assertion：
assert(worker.id in this.all === false);
意思是工人不再循环。
我不认为这与PM2有关，但有一个错误。 PM2不应该崩溃。我通过引用此stackoverflow建议您report an issue。如果它是一个节点错误，不确定它是否可以修复。
可悲的是目前没有解决这个问题，但你可以看一下nodejs issue。我已经读过iojs修复了这个问题，也许你可以尝试一下;）。
另一个相关的stackoverflow：NodeJS Cluster unexpected assert.AssertionError。