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#aws-lambda

2 stories

Cloud & Infrastructure Bug Report

Lambda writes to the bucket that triggers it: a recursive loop and a cost spike

Ryan Pham · Feb 11, 2026 · 6 min read

A refactor changed one output prefix in an image processing Lambda, and the function started triggering itself. Invocations went from 40,000 a day to 9 million in six hours. We stopped it with reserved concurrency, then separated input and output and added loop guards.

Banner: AWS Lambda cold start timeouts and exhausted RDS database connections

Cloud & Infrastructure Bug Report

AWS Lambda times out on cold start and exhausts RDS connections

Daniel Tran · Jun 10, 2025 · 9 min read

Every deploy and every traffic burst, the first requests to our booking API timed out and Postgres started refusing clients. The handler did heavy setup and opened a fresh connection per invocation. Moving init out of the handler and adding RDS Proxy fixed it.