8/11/2023 0 Comments Sqs queue lambdaZac Charles, serverless engineer at Stedi, who called the issue " SQS overpull" in the past, now warns: Great to see an official solution for this! Previously the best workaround was to use FIFO queues and manage concurrency using group ids. This is awesome news! Finally a proper solution for the SQS over-polling problem that you can run into with Lambda. Yan Cui, cloud consultant and AWS Serverless Hero, comments: The demo application deploys a Lambda function that runs for 10 seconds, an event source mapping with a maximum concurrency of 5, and an SQS queue with a visibility timeout of 20 seconds to simulate a high function concurrency with a small number of messages. This ensures that the specified Lambda function can always scale to that much concurrency, but it also cannot exceed this number.ĪWS has made available a repository containing a SAM application to test the Maximum Concurrency. To prevent this from happening, you can set reserved concurrency for individual Lambda functions. The scale-out can consume the concurrency quota in the account. When a large number of messages are in the SQS queue, Lambda scales out, adding additional functions to process the messages. John Lee and Jeetendra Vaidya, solutions architects at AWS, explain: The elastic ESM polls the queue for messages and invokes a Lambda function accordingly, with the maximum number of messages to be processed simultaneously determined by the service limits for both services.Īlthough using SQS as an event source for Lambda is a common pattern in serverless architectures, determining the appropriate concurrency, visibility timeouts, and maxReceiveCount settings has been a challenge in the past. Setting the Maximum Concurrency, developers can determine the concurrency of the functions processing messages in individual SQS queues, simplifying the scalability of serverless applications.Īn event source mapping (ESM) enables a Lambda function to subscribe to an SQS queue, scaling according to the number of messages in the queue. AWS Lambda now provides a way to control the maximum number of concurrent functions invoked by Amazon SQS as an event source.
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