Integrating Event Source Mappings with AWS Lambda tenant isolation mode

This article explains how to integrate AWS Lambda tenant isolation mode with Event Source Mappings for secure multi-tenant SaaS applications.

• Lambda tenant isolation mode routes invocations to tenant-specific execution environments automatically
• Event sources don't natively support mapping tenant IDs to X-Amz-Tenant-Id headers
• Use a lightweight routing Lambda function to extract tenant IDs from event payloads
• Routing function invokes backend function with TenantId parameter via Lambda Invoke API
• Works with SQS, EventBridge, Kinesis, and DynamoDB Streams event sources
• Validate tenant identity before invocation to prevent unauthorized access
• Use asynchronous invocation for routing functions to reduce latency
• Monitor concurrency usage as each tenant consumes resources independently
• Sample code available in AWS GitHub repository with SAM infrastructure

This pattern enables secure, scalable event-driven multi-tenant applications while maintaining per-tenant compute isolation without managing separate functions per tenant.