Low-latency, high-throughput SQS event processing with AWS Lambda provisioned mode

This article explains AWS Lambda provisioned mode for SQS event source mappings, which provides explicit control over event pollers for demanding, latency-sensitive workloads.

• Provisioned mode allows configuring minimum (2-200) and maximum (2-10,000) event pollers for predictable scaling
• Supports up to 100,000 concurrent Lambda executions and 10 GB/s throughput, processing up to 1 million events per second
• Achieves 55% faster message backlog draining compared to default mode in test scenarios
• Configure via AWS CLI, SAM templates, or CloudFormation with MinimumPollers and MaximumPollers parameters
• Right-size minimum pollers using formula: max(TargetConcurrency/10, TargetThroughputMBps/1)
• Billed on event poller unit (EPU) hours; monitor with CloudWatch metrics including ProvisionedPollers and queue depth
• Ideal for real-time payments, fraud detection, IoT pipelines, and flash-sale order fulfillment

Provisioned mode integrates into existing deployment workflows and delivers 3x faster scaling than default mode for high-demand event processing applications.