There are few log entries more frustrating to a backend engineer than Task timed out after 3.00 seconds . It is the silent killer of serverless reliability. Your code works locally, your unit tests pass, yet in production, the Lambda function hangs until AWS forcibly kills the container. This error doesn't just degrade user experience; it inflates your AWS bill. A function configured with a 30-second timeout that hangs on every invocation is billing you for max duration on every failure, often triggering automatic retries that compound the cost. This guide dissects the root causes of Lambda timeouts in Node.js and Python environments and provides production-grade patterns to resolve them. The Anatomy of a Timeout To fix a timeout, you must understand the Lambda execution lifecycle. When a request hits your function, AWS spins up an execution environment (a microVM). A timeout occurs when the handler function is invoked but fails to signal completion to the Lambda runtime A...
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