Question

我的NodeJS rabbitmq工作者经常抛出如下的异常：

events.js:72
        throw er; // Unhandled 'error' event

    Error: PRECONDITION_FAILED - unknown delivery tag 3
        at Queue._onMethod (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:1720:15)
        at Queue.Channel._onChannelMethod (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:1365:14)
        at Connection._onMethod (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:922:28)
        at AMQPParser.parser.onMethod (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:797:12)
        at AMQPParser._parseMethodFrame (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:442:10)
        at frameEnd (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:187:16)
        at frame (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:172:14)
        at AMQPParser.header [as parse] (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:159:14)
        at AMQPParser.execute (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:231:21)
        at Connection.<anonymous> (/Users/Rana/WebstormProjects/TS/ts-worker/node_modules/amqp/amqp.js:837:12)
        at Connection.emit (events.js:95:17)
        at Connection.<anonymous> (_stream_readable.js:765:14)
        at Connection.emit (events.js:92:17)
        at emitReadable_ (_stream_readable.js:427:10)
        at emitReadable (_stream_readable.js:423:5)
        at readableAddChunk (_stream_readable.js:166:9)
        at Connection.Readable.push (_stream_readable.js:128:10)

我的工作人员代码如下所示：

    connection.queue('task-queue-name', {autoDelete: false, durable: true}, function(queue){
       queue.subscribe({ack: true, prefetchCount: 1}, function(params){
               //custom code
               queue.shift();
      });
  });

有没有人知道导致问题的原因可能是什么？感谢。

Answer 1

至少有两个原因我可以想到为什么会发生这种情况：

您多次呼叫queue.shift()同一条消息
如果您在同一个节点进程中的同一队列上有多个侦听器

您可以单独确认消息，而不是使用shift：

queue.subscribe({ OPTS }, function (message, headers, deliveryInfo, messageObject) {
  messageObject.acknowledge(false);
  // or: messageObject.reject(true|false);
});

请参阅the documentation以及this issue。

RabbitMQ工作者崩溃问题

1 个答案: