Rabbitmq Message Expiration. Rabbitmq is the most widely deployed open source message broker. The expiration time ttl indicates that the expected time can be set for the message, and within this time, it can be received and obtained by the consumer;
03 reliable delivery of messages and dead letter queue from chowdera.com
Use a community plugin rabbitmq_delayed_message_exchange (not recommended for production environment) use dead letter exchange with message ttl. Another way to specify message ttl is the use of expiration field of message properties. But, rabbitmq uses the amqp protocol that doesn't have any native feature to send scheduled or delayed messages.
This Message Expires Just Fine:
There are four configurations in the code. Ttl (time to live), the time that the message survives, that is, the validity period of the message. The messages tries to reach consumer immediately.
In Other Words, This Is What Will Happen:
The expiration time ttl indicates that the expected time can be set for the message, which can be received by the consumer within this time; If the expiration time of messages in the queue is not fixed, subsequent messages will expire but still not be processed. Even if the message is not consumed, the message will always be stored in the queue.
Message Expiration Only Works With Versions Of Rabbitmq Newer Than 3.0.0.
But, rabbitmq uses the amqp protocol that doesn't have any native feature to send scheduled or delayed messages. Consumers will not have expired messages delivered to them. It may not be read because the message was rejected by the listeners, or because the queue was full or due to the message expiration time.
But There Are Ways To Implement This:
At present, there are two ways to set it the first method is through the setting of queue properties, all messages in the queue have the same expiration. This means that basic.ack, basic.nack, and basic.reject with old delivery tags will cause a channel exception. With tens of thousands of users, rabbitmq is one of the most popular open source message brokers.
The Message Will Be Consumed After The Specified Time.
The delay switch polls all messages. Therefore, the delay queue can be used. If it's not possible, the message is considered as dead.
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