Aws Sqs

SQS is the standard for async task queuing on AWS — used by virtually every AWS-based application for decoupling services, buffering work, and enabling reliable asynchronous processing. Standard queues provide unlimited throughput with at-least-once delivery; FIFO queues provide exactly-once delivery at up to 3000 messages/second. For agents: send tasks to a queue, have workers receive and process them, delete on success or leave for retry on failure. Long polling reduces empty receive costs. Dead-letter queues for failed message handling. Confidence is docs-derived.

AWS SDK (boto3): sqs = boto3.client("sqs"). sqs.send_message(QueueUrl=url, MessageBody=json.dumps(payload)). sqs.receive_message(QueueUrl=url, MaxNumberOfMessages=10, WaitTimeSeconds=20) — long polling. sqs.delete_message(QueueUrl=url, ReceiptHandle=handle). sqs.change_message_visibility(QueueUrl=url, ReceiptHandle=handle, VisibilityTimeout=60) — extend processing time. Batch: send_message_batch, receive_message (max 10), delete_message_batch. FIFO: MessageGroupId + MessageDeduplicationId for ordering/deduplication.

IAM auth: AWS credentials (env vars, IAM role). Per-operation permissions: sqs:SendMessage, sqs:ReceiveMessage, sqs:DeleteMessage, sqs:ChangeMessageVisibility. Queue-level resource policies for cross-account access. Server-side encryption via SSE-SQS or SSE-KMS. HTTPS enforced.

OverLimit for concurrent receive requests. QueueDoesNotExist: handle gracefully (queue may have been deleted). Message visibility timeout: design workers to complete within timeout or use ChangeMessageVisibility. DLQ for messages exceeding maxReceiveCount. SQS SLA: 99.9%. Message retention: 1 minute to 14 days (default 4 days). Standard queue: at-least-once (duplicate handling in consumer required).

docs.aws.amazon.com/sqs provides comprehensive documentation — standard vs FIFO comparison, API reference, best practices, and getting started. Getting started: create queue via console/CLI, boto3 installed, first message in under 5 minutes. Free tier: 1M requests/month. Lambda SQS trigger for event-driven consumers. Community via AWS Forums and StackOverflow.