![]() ![]() ![]() You can introduce an SQS queue between your API Gateway and your consumers to balance the load on your consumers. SNS to SQS: an SQS queue can subscribe to an Amazon SNS topic, such that every message sent to the topic will be automatically sent to the SQS queue.ĮventBridge to SQS: If you're using EventBridge, it's pretty common to set an EventBridge rule to push a message to an SQS queue.ĪPI Gateway to SQS: One of the more interesting SQS integrations is with API Gateway.But SQS integrations are not limited to Lambda functions: A very common use-case is to trigger a Lambda function when a message is sent to a queue. ![]() SQS fits in within the wider AWS Serverless Ecosystem, as the preferred queuing service. Messages received within this timeframe can be processed in batches, up to 10 messages per batch.Īdditionally, a producer can send messages with associated metadata attributes which are a set of key-value pairs which can be used by consumers to handle the message in a particular way without having to process the message body first. Long polling sets SQS to wait a user-defined period of time before messages sent to a queue become available to consumers. SQS sets a visibility timeout on a message once received by a consumer, a period of time during which other consumers cannot receive and process the same message.Ī common trick for near-real-time applications is to enable long polling on SQS queues and process messages in batches. When a message is successfully processed by a consumer, the consumer must delete it from the queue.Īlso, the same message cannot be received by multiple consumers simultaneously. Consumers have to poll messages from SQS. A single queue can have multiple producers and multiple consumers, and each message will be processed at least once for Standard queues, and exactly once for FIFO queues.Ĭontrary to common belief, SQS consumers follow a pull delivery system, rather than a push delivery system. The same HTTP API is used to interface with both standard and FIFO queues. Once a queue is created, SQS returns a queue URL in the format The queue URL is necessary to send messages to, and to receive messages from the queue. You can create queues through the AWS console, the SQS HTTP API (using the CLI or the SDK) or with your favourite Infrastructure as Code solution. This helps developers protect downstream services from processing the same message multiple times. Simply submit a message deduplication ID, and if a message with a message deduplication ID is sent successfully, any subsequent messages sent with the same deduplication ID are accepted but are not delivered during a 5-minute deduplication interval. FIFO: First In First Out queues, which guarantee that messages are processed exactly once, in the exact order they are sentįIFO queues also handle automatic deduplication of messages.Standard: your standard queues, which cover the vast majority of use-cases.They work well for exchanging messages between applications in cloud architectures thanks to the HTTP API SQS exposes, over which applications can send and read messages. SQS queues are distributed across multiple availability zones within the same AWS region to ensure high availability. It is a fully managed and serverless queueing service: you do not need to provision and maintain your own servers for a highly available and scalable message queueing system. Amazon SQS (Simple Queue Service) is one of my favourite services on Amazon Web Services. ![]()
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