How to acknowledge message in Rabbitmq in a different channel











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I have a query on RabbitMq consumer acknowledgement, I read documentation on RabbitMq stating that acknowledging the message should be on the same channel from which consumer received. But I'm in a situation where due to some reason consumer process is stopped after I received message and haven't acknowledge the Rabbitmq, when the consumer process is restarted, consumer starts getting unacknowledged messages from RabbitMq, but here consumer cannot send the acknowledge to those messages as I get a channel exception stating the tag doesn't belongs to the channel. So, my question is how to handle this scenario and how can I acknowledge the rabbitmq to remove the message after my consumer process is completed reading the message?










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    I have a query on RabbitMq consumer acknowledgement, I read documentation on RabbitMq stating that acknowledging the message should be on the same channel from which consumer received. But I'm in a situation where due to some reason consumer process is stopped after I received message and haven't acknowledge the Rabbitmq, when the consumer process is restarted, consumer starts getting unacknowledged messages from RabbitMq, but here consumer cannot send the acknowledge to those messages as I get a channel exception stating the tag doesn't belongs to the channel. So, my question is how to handle this scenario and how can I acknowledge the rabbitmq to remove the message after my consumer process is completed reading the message?










    share|improve this question
























      up vote
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      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a query on RabbitMq consumer acknowledgement, I read documentation on RabbitMq stating that acknowledging the message should be on the same channel from which consumer received. But I'm in a situation where due to some reason consumer process is stopped after I received message and haven't acknowledge the Rabbitmq, when the consumer process is restarted, consumer starts getting unacknowledged messages from RabbitMq, but here consumer cannot send the acknowledge to those messages as I get a channel exception stating the tag doesn't belongs to the channel. So, my question is how to handle this scenario and how can I acknowledge the rabbitmq to remove the message after my consumer process is completed reading the message?










      share|improve this question













      I have a query on RabbitMq consumer acknowledgement, I read documentation on RabbitMq stating that acknowledging the message should be on the same channel from which consumer received. But I'm in a situation where due to some reason consumer process is stopped after I received message and haven't acknowledge the Rabbitmq, when the consumer process is restarted, consumer starts getting unacknowledged messages from RabbitMq, but here consumer cannot send the acknowledge to those messages as I get a channel exception stating the tag doesn't belongs to the channel. So, my question is how to handle this scenario and how can I acknowledge the rabbitmq to remove the message after my consumer process is completed reading the message?







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      asked Nov 22 at 8:37









      Abhinay

      1441317




      1441317
























          1 Answer
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          As you said acknowledgement must be sent on the same channel




          Acknowledgement must be sent on the same channel the delivery it is for was received on. Attempts to acknowledge using a different channel will result in a channel-level protocol exception




          The easy way to do that is to use autoack=true, so the message acknowledged automatically once it is consumed.



          boolean autoAck = true; // acknowledgment is covered below
          channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer);


          EDIT



          if auto_ack does not work for you, you could use channel_consumer.basicCancel(consumerTag);



          something like that:



             final Consumer consumer = new DefaultConsumer(channel_consumer) {
          @Override
          public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
          channel_consumer.basicCancel(consumerTag);
          System.out.println(" [x] stopping" + message + "'");

          try {
          Thread.sleep(10000);
          } catch (InterruptedException e) {
          e.printStackTrace();
          }
          System.out.println(" [x] elaborated getting ack" + message + "'");
          channel_consumer.basicAck(envelope.getDeliveryTag(), false);

          } finally {
          System.out.println(" [x] Done");
          }
          }
          };
          boolean autoAck = false; // acknowledgment is covered below
          channel_consumer.basicConsume("test", autoAck, consumer);





          share|improve this answer























          • We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
            – Abhinay
            Nov 22 at 9:15










          • @Abhinay updated the answer
            – Gabriele
            Nov 22 at 9:38










          • for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
            – Abhinay
            Nov 22 at 10:59











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          1
          down vote













          As you said acknowledgement must be sent on the same channel




          Acknowledgement must be sent on the same channel the delivery it is for was received on. Attempts to acknowledge using a different channel will result in a channel-level protocol exception




          The easy way to do that is to use autoack=true, so the message acknowledged automatically once it is consumed.



          boolean autoAck = true; // acknowledgment is covered below
          channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer);


          EDIT



          if auto_ack does not work for you, you could use channel_consumer.basicCancel(consumerTag);



          something like that:



             final Consumer consumer = new DefaultConsumer(channel_consumer) {
          @Override
          public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
          channel_consumer.basicCancel(consumerTag);
          System.out.println(" [x] stopping" + message + "'");

          try {
          Thread.sleep(10000);
          } catch (InterruptedException e) {
          e.printStackTrace();
          }
          System.out.println(" [x] elaborated getting ack" + message + "'");
          channel_consumer.basicAck(envelope.getDeliveryTag(), false);

          } finally {
          System.out.println(" [x] Done");
          }
          }
          };
          boolean autoAck = false; // acknowledgment is covered below
          channel_consumer.basicConsume("test", autoAck, consumer);





          share|improve this answer























          • We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
            – Abhinay
            Nov 22 at 9:15










          • @Abhinay updated the answer
            – Gabriele
            Nov 22 at 9:38










          • for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
            – Abhinay
            Nov 22 at 10:59















          up vote
          1
          down vote













          As you said acknowledgement must be sent on the same channel




          Acknowledgement must be sent on the same channel the delivery it is for was received on. Attempts to acknowledge using a different channel will result in a channel-level protocol exception




          The easy way to do that is to use autoack=true, so the message acknowledged automatically once it is consumed.



          boolean autoAck = true; // acknowledgment is covered below
          channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer);


          EDIT



          if auto_ack does not work for you, you could use channel_consumer.basicCancel(consumerTag);



          something like that:



             final Consumer consumer = new DefaultConsumer(channel_consumer) {
          @Override
          public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
          channel_consumer.basicCancel(consumerTag);
          System.out.println(" [x] stopping" + message + "'");

          try {
          Thread.sleep(10000);
          } catch (InterruptedException e) {
          e.printStackTrace();
          }
          System.out.println(" [x] elaborated getting ack" + message + "'");
          channel_consumer.basicAck(envelope.getDeliveryTag(), false);

          } finally {
          System.out.println(" [x] Done");
          }
          }
          };
          boolean autoAck = false; // acknowledgment is covered below
          channel_consumer.basicConsume("test", autoAck, consumer);





          share|improve this answer























          • We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
            – Abhinay
            Nov 22 at 9:15










          • @Abhinay updated the answer
            – Gabriele
            Nov 22 at 9:38










          • for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
            – Abhinay
            Nov 22 at 10:59













          up vote
          1
          down vote










          up vote
          1
          down vote









          As you said acknowledgement must be sent on the same channel




          Acknowledgement must be sent on the same channel the delivery it is for was received on. Attempts to acknowledge using a different channel will result in a channel-level protocol exception




          The easy way to do that is to use autoack=true, so the message acknowledged automatically once it is consumed.



          boolean autoAck = true; // acknowledgment is covered below
          channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer);


          EDIT



          if auto_ack does not work for you, you could use channel_consumer.basicCancel(consumerTag);



          something like that:



             final Consumer consumer = new DefaultConsumer(channel_consumer) {
          @Override
          public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
          channel_consumer.basicCancel(consumerTag);
          System.out.println(" [x] stopping" + message + "'");

          try {
          Thread.sleep(10000);
          } catch (InterruptedException e) {
          e.printStackTrace();
          }
          System.out.println(" [x] elaborated getting ack" + message + "'");
          channel_consumer.basicAck(envelope.getDeliveryTag(), false);

          } finally {
          System.out.println(" [x] Done");
          }
          }
          };
          boolean autoAck = false; // acknowledgment is covered below
          channel_consumer.basicConsume("test", autoAck, consumer);





          share|improve this answer














          As you said acknowledgement must be sent on the same channel




          Acknowledgement must be sent on the same channel the delivery it is for was received on. Attempts to acknowledge using a different channel will result in a channel-level protocol exception




          The easy way to do that is to use autoack=true, so the message acknowledged automatically once it is consumed.



          boolean autoAck = true; // acknowledgment is covered below
          channel.basicConsume(TASK_QUEUE_NAME, autoAck, consumer);


          EDIT



          if auto_ack does not work for you, you could use channel_consumer.basicCancel(consumerTag);



          something like that:



             final Consumer consumer = new DefaultConsumer(channel_consumer) {
          @Override
          public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
          channel_consumer.basicCancel(consumerTag);
          System.out.println(" [x] stopping" + message + "'");

          try {
          Thread.sleep(10000);
          } catch (InterruptedException e) {
          e.printStackTrace();
          }
          System.out.println(" [x] elaborated getting ack" + message + "'");
          channel_consumer.basicAck(envelope.getDeliveryTag(), false);

          } finally {
          System.out.println(" [x] Done");
          }
          }
          };
          boolean autoAck = false; // acknowledgment is covered below
          channel_consumer.basicConsume("test", autoAck, consumer);






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 22 at 9:38

























          answered Nov 22 at 9:13









          Gabriele

          14.4k42233




          14.4k42233












          • We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
            – Abhinay
            Nov 22 at 9:15










          • @Abhinay updated the answer
            – Gabriele
            Nov 22 at 9:38










          • for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
            – Abhinay
            Nov 22 at 10:59


















          • We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
            – Abhinay
            Nov 22 at 9:15










          • @Abhinay updated the answer
            – Gabriele
            Nov 22 at 9:38










          • for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
            – Abhinay
            Nov 22 at 10:59
















          We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
          – Abhinay
          Nov 22 at 9:15




          We want to acknowledge only once we performed some operation like persisting/processing the message, so don't want to auto acknowledge.
          – Abhinay
          Nov 22 at 9:15












          @Abhinay updated the answer
          – Gabriele
          Nov 22 at 9:38




          @Abhinay updated the answer
          – Gabriele
          Nov 22 at 9:38












          for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
          – Abhinay
          Nov 22 at 10:59




          for channel_consumer.basicCancel(consumerTag); is there any restrictions like it should be in same channel like basicAck has? if so, then basicCancel also cannot be used in my scenario.
          – Abhinay
          Nov 22 at 10:59


















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