Instead we need to create defensive workers that react to failure situations appropriately.
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In the case of "poison" messages that can never successfully be processed, this means sending the reject response with the requeue option set to false so that the message will never be processed. If there is a dead letter exchange, the message is routed there and if not, it gets binned. Configuring the dead letter exchange is part of the queue setup. The examples here use the rabbitmqadmin tool , but you could use the same approach in any of the language-specific libraries. For messages which could potentially be reprocessed later a good example is the unresponsive 3rd party API that could be experiencing temporary failure , it could be more appropriate to send the reject response to indicate that the message wasn't processed, but with the requeue option set to true.
This puts the message back on the queue for another worker to collect later. But if the failure persists, these essentially become poison messages as well, because our workers will try to process, fail to process, put them back on the queue RabbitMQ does not have built-in functionality for counting retries, but it is trivial to implement this yourself: You can't edit messages which is why you need a new one. Acknowledge the original message, and put the new message onto the queue.
Then you can check the retries count each time the message goes to a worker for processing. If it fails, either create a new message with updated metadata or permanently fail the message by sending reject with requeue set to false. Again, if there's a dead letter exchange the message goes there, so we'll be able to see what didn't get processed. Contemplating what we know about the status and experience of any given message can help to work out what the next move is when dealing with failure cases. The following diagram attempts to summarise the cases and some recommended reactions to different outcomes.
Thinking about whether the message should remain in the queue until it can be processed, or whether the system should just move on so that it services the immediate messages as best it can, is a very important step in working with queues. Does it matter if one gets missed? A common setup there would be to add retry logic to the emails so that they are sent eventually, even if they are delayed by a few minutes. If the push message to the browser fails, then the application may not bother to try to recover as the notification is less valuable if not delivered at the right moment.
Sometimes it makes sense to maintain very long queues. The main variable is more around the time a message typically spends in the queue rather than the queue length itself. In this case, it is often useful to specify a maximum length of queue. Beyond this size, messages are either dropped, or sent to the dead letter exchange if there is one.
To specify a queue with a maximum length, use a declaration like this:. Thank you for your feedback! If applicable fill in the countries where you are using Twilio. This guide outlines a few of the most common problems and provides troubleshooting tips: My Messages are Delayed. You can find some sample requests for sending SMS messages in your language of choice here on our documentation.
Debugging Common Issues with SMS
These sample requests can help isolate any syntax issues that may crop up in your code. If you can't find the SMS in your logs and you received an error from Twilio: You can look up the error code you received here. This can happen for several reasons , including carrier content filtering or availability of the destination phone. Do you have an SMS-enabled Twilio number?
Does it have a webhook configured? Are you expecting to receive SMSes from international numbers? Are you roaming or off your network? Twilio cannot guarantee the deliverability of SMSes from roaming phone numbers.
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Twilio does not have the ability to determine whether or not the phone number you are sending SMS from is roaming at the time. Are you expecting to receive SMSes from a short code? Because of this, services like Google Voice, Facebook, and Skype, which use short codes e. Why do I Encounter Duplicate Messages? My Messages are Delayed To troubleshoot issues with delayed messages or other delivery issues, start by testing your numbers with the API Explorer.
When you send a message via the API Explorer, one of three things will happen: The message arrives within 30 seconds The problem with your messages most likely comes from your application code. Try using the code snippet generated in the API Explorer in your application and see if that fixes the issue. Check your HTTP logs and verify the requests you made to Twilio did not result in or level errors.
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Please note that using the Test Credentials will produce a response indicating that the message has been sent, but the message will not actually send. The message arrives more than 30 seconds later SMS messages sent from Twilio typically arrive at their destination within 5 to 10 seconds, depending on the country and the carrier.
If a message takes more than 30 seconds for delivery, we consider it 'delayed'. This info provides insights to help you track down where latency may originate. A large number of queued messages on the 'From' number may increase latency.
Opening the Console
There may be congestion on downstream carrier networks. These problems usually resolve automatically when downstream traffic starts to clear. Verify that the 'To' phone number: