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RabbitMQ: re-consume non-acked message in fanout exchange


RabbitMQ: re-consume non-acked message in fanout exchange

By : Mike Kuykendall
Date : November 19 2020, 03:01 PM
around this issue That's because you declared an exclusive queue. It's deleted once the connection is lost. So when you pushed Ctrl + C, queue was dropped, and when you run that script again, there was a new queue with no messages in it. So you need to declare a queue non-exclusive:
code :
$channel->queue_declare("queue1", false, true, false, false);


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Trouble with RabbitMQ fanout exchange

Trouble with RabbitMQ fanout exchange


By : Wilhelm Kuhn
Date : March 29 2020, 07:55 AM
will help you It sounds like all of your consumers are subscribing to the same queue. When multiple consumers are subscribing to the same queue, the default behavior of RabbitMQ is to round-robin the messages between all the subscribed consumers. See "Round-robin dispatching" in the RabbitMQ Tutorial #2: Work Queues.
The fanout exchange is for ensuring that each queue bound to it gets a copy of the message, not each consumer. If you want each consumer to get a copy of the message, typically you would have each consumer create their own queue and then bind to the exchange. I'm not sure why you're trying to avoid programmatically creating/binding a queue, but if you know ahead of time the number of subscribers and create a queue for each one, you can get the same effect.
Message only gets published to one queue in a RabbitMQ Fanout exchange (java)

Message only gets published to one queue in a RabbitMQ Fanout exchange (java)


By : Qazi Tehmas Waheed
Date : March 29 2020, 07:55 AM
I hope this helps . From the screen captures, it seems your configuration is ok and the message is reaching both queues. But the consumer configuration on each queue is not the same:
storeEmailQueue has consumer ack configured outboundEmailQueue has autoack configured
Rabbitmq Fanout Exchange C#

Rabbitmq Fanout Exchange C#


By : Dàli Trigùi
Date : March 29 2020, 07:55 AM
it fixes the issue So I find your issue. First of all your exchange declaration in your consumer is wrong.
You declare exchange as "example.exchange" in your publisher :
code :
channel.ExchangeDeclare("example.exchange", ExchangeType.Fanout, true, false, null);
channel.QueueBind(queue: queueName, exchange: "foo.exchange", routingKey: "");
public static void Main(string[] args)
{
    ConnectionFactory factory = new ConnectionFactory();
    factory.UserName = "guest";
    factory.Password = "guest";
    factory.HostName = "localhost";
    factory.VirtualHost = "/";

    var connection = factory.CreateConnection();
    var channel = connection.CreateModel();

    var queueName = "test-queue";
    channel.QueueDeclare(queueName, false, false, false, null);
    channel.QueueBind(queueName, "example.exchange", "", null);

    var consumer = new EventingBasicConsumer(channel);
    consumer.Received += (model, ea) =>
    {
        var bodyy = ea.Body;
        var messagee = Encoding.UTF8.GetString(bodyy);
        Console.WriteLine("received [x] {0}", messagee);
    };
    channel.BasicConsume(queue: queueName, autoAck: true, consumer: consumer);

    Console.ReadLine();
}
why rabbitmq fanout exchange only one subscribe can be received message?

why rabbitmq fanout exchange only one subscribe can be received message?


By : Zach
Date : March 29 2020, 07:55 AM
it fixes the issue No, you misunderstood the fanout exchange definition. It puts the message to all binded queues., but not to subscribes for those queues.
It does not have value how much subscribers (listeners) you have for the same queue. They are just concurrent consumers and only the one of them will receive a message from the queue.
RabbitMQ: Message acked by exchange without any existing bindings to it

RabbitMQ: Message acked by exchange without any existing bindings to it


By : Nabeel Kausari
Date : March 29 2020, 07:55 AM
may help you . It is by design. Check this link. It says clearly:
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