Question

我正在尝试通过打开读取流来读取某个文件，并通过ZMQ将文件块发送到另一个进程来使用它们。流正在运行，但是当我启动worker时，它看不到已发送的数据。

我尝试每隔500毫秒通过套接字发送数据，而不是在回调中，当我启动工作时，它会收集所有以前的数据块：

sender = zmq.socket('push')
setInterval(() ->
  console.log('sending work');
  sender.send('some work')
, 500)

receiver = zmq.socket("pull")
receiver.on "message", (msg) ->
  console.log('work is here: %s', msg.toString())

输出：

sending work
sending work
sending work
sending work
sending work
// here I start the worker
sending work
work is here: some work
work is here: some work
work is here: some work
work is here: some work
work is here: some work
work is here: some work
sending work
work is here: some work
sending work
work is here: some work
sending work
work is here: some work

因此，当工作人员启动时，它会从拉动所有先前的数据开始，然后每次进入时都会将其拉出。这在我执行此操作时不适用：

readStream = fs.createReadStream("./data/pg2701.txt", {'bufferSize': 100 * 1024})
readStream.on "data", (data) ->
  console.log('sending work');
  sender.send('some work'); // I'd send 'data' if it worked..

在这种情况下，工作人员根本不会提取任何数据。这些套接字是否应该创建队列？我在这里缺少什么？

Answer 1

是的，推送套接字阻塞，直到达到HWM，并且无人发送。也许发件人尚未约束，尝试这样的事情：

sender.bind('address', function(err) {
  if (err) throw err;
  console.log('sender bound!');

  // the readStream code.
}

你的代码示例中也缺少connect，我打赌它在那里，但也许你忘了它。

ZeroMQ推/拉和nodejs读流

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