All 7 Amazon SQS (Simple Queue Service) questions
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What is the difference between SQS Standard queues and FIFO queues? What is visibility timeout in SQS, and why is it important for reliable message processing? What is a dead letter queue in SQS, and why is it useful for handling failed messages? How does long polling in SQS improve efficiency compared to short polling? What strategies help you design SQS based systems for exactly once processing semantics despite the underlying at least once delivery guarantee?
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How does SQS integrate with Lambda for event driven message processing, including batching behavior?

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Answer

Lambda can be configured with an SQS queue as an event source, automatically polling the queue and invoking your function with a batch of messages whenever they become available, and you can configure batch size and batching window settings to control how many messages are grouped into a single invocation, letting you balance between processing latency and the efficiency of handling multiple messages together in one function execution.
aws lambda create-event-source-mapping --function-name processOrders --event-source-arn arn:aws:sqs:us-east-1:123456789012:OrderQueue --batch-size 10
Real-world example An order processing pipeline configures its Lambda function to process up to ten SQS messages per invocation, reducing the number of Lambda invocations needed compared to processing one message at a time, while still keeping processing latency low.

Common follow-ups: What happens if one message in a batch fails while others succeed?;How does Lambda concurrency scale with SQS queue depth?

Lambda & Serverless;Monitoring (CloudWatch)
All 7 Amazon SQS (Simple Queue Service) questions