Tech-Reader.blog

  AWS Lambda Error – Unhandled Promise Rejection # aws # lambda # devops # cloud By ensuring all async calls are awaited, wrapping logic in try/catch, and avoiding unsupported async patterns, you prevent silent failures and keep your Lambda’s execution predictable and stable. Problem Your Node.js Lambda runs but abruptly fails with errors such as: UnhandledPromiseRejectionWarning: Unhandled promise rejection or: Task timed out after X seconds Cause: Runtime.UnhandledPromiseRejection This happens when a Promise rejects and no valid  .catch()  or surrounding  try/catch  handles it. Missing  await  on asynchronous calls Functions returning before async work completes Errors thrown inside callbacks or background tasks Clarifying the Issue Lambda requires your handler to either resolve or reject its returned Promise. If your function exits early or leaves async work running in the background, the runtime cannot capture the error — and you get an unhandled r...

  AWS Lambda Error – Memory size must be between X MB and Y MB # aws # lambda # devops # cloud A practical diagnostic guide for resolving Lambda memory configuration failures caused by invalid values, drift between IaC and console settings, or runtime-level misalignment during updates. Problem Your Lambda deploy or update fails immediately with: An error occurred (InvalidParameterValueException) when calling the UpdateFunctionConfiguration operation: Memory size must be between 128 MB and 10240 MB or: Invalid memory size: 64. Value must be between 128 MB and 3008 MB for this runtime. Lambda rejects the configuration before the deployment completes. Memory value set below the minimum for the runtime IaC configuration out of sync with Lambda’s current limits Updating memory without updating architectural constraints Clarifying the Issue Each Lambda runtime enforces its own memory constraints, and AWS updates these limits from time to time. If your IaC template contains outdated value...

When Goroutines Got in the Way: Mia's Thursday Night # go # coding # programming # softwaredevelopment When a race condition taught her that sometimes the most elegant code needs the most careful testing FAIL: TestOrderProcessingConcurrent Expected 500 orders, got 497 race detected: write at 0x... concurrent with write at 0x... Mia stared at the terminal, the red text somehow angrier in the empty office than it had been five minutes ago. Three orders. Three orders had vanished, and Go's race detector was screaming about concurrent writes, but the code  looked  perfect. It was 9:15 PM on a Thursday. The Seattle tech hub had emptied out hours ago—the coffee machines in the break room were cold, the standing desks were all down, and the only sound was the white noise hum of servers somewhere in the building and the occasional creak of the building settling into night. Mia had been promising this feature for two weeks. The Setup That morning, she'd demoed the order processi...