![]() ![]() You can use FIFO topics and queues together to simplify the implementation of applications where the order of operations and events is critical, or when you cannot tolerate duplicates. If you subscribe a FIFO queue to a FIFO topic, the deduplication ID is passed to the queue and it is used by SQS to avoid duplicate messages being received. After a message with a specific deduplication ID is published successfully, there is a 5-minute interval during which any message with the same deduplication ID is accepted but not delivered. With message content-based deduplication, SNS uses a SHA-256 hash to generate the message deduplication ID using the body of the message. You can avoid duplicated message deliveries from the topic in two ways: either by enabling content-based deduplication on the topic, or by adding a deduplication ID to the messages that you publish. The message group ID is passed to any subscribed FIFO queue.ĭeduplication – Distributed systems (like SNS) and client applications sometimes generate duplicate messages. If you don’t have a logical distinction between messages, you can simply use the same message group ID for all and have a single group of ordered messages. You don’t need to declare in advance the message group ID, any value will work. ![]() There is no limit in the number of message groups with FIFO topics and queues. For example, to ensure the delivery of messages related to the same customer in order, you can publish these messages to the topic using the customer’s account number as the message group ID. For each message group ID, all messages are sent and delivered in order of their arrival. Ordering – You configure a message group by including a message group ID when publishing a message to a FIFO topic. Today, we are adding similar capabilities for pub/sub messaging with the introduction of SNS FIFO topics, providing strict message ordering and deduplicated message delivery to one or more subscribers.įIFO topics manage ordering and deduplication similar to FIFO queues: With SQS, you can use FIFO (First-In-First-Out) queues to preserve the order in which messages are sent and received, and to avoid that a message is processed more than once. Using topics and queues together, you can decouple microservices, distributed systems, and serverless applications. You can use topics when you want to fan out messages to multiple applications, and queues when you want to send messages to one application. Each subscriber can also set a filter policy to receive only the messages that it cares about. On AWS, Amazon Simple Notification Service (SNS) is a fully managed pub/sub messaging service that enables message delivery to a large number of subscribers.
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