Fail-fast vs bounded queue: the overload tradeoff nobody explains well
Queues reshape overload rather than eliminating it. See the tradeoff between immediate rejection and delayed pain.
Technical journal
Fail-fast admission control for overloaded Node.js systems.
Articles, examples, and operational notes for async-bulkhead packages, including fetch, Express, LLM workloads, and future database adapters.
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Return 503 before your Express route melts down
Route-level bulkheads let expensive Express handlers reject overload before downstream work begins.
Stop letting LLM calls blow up your server
Most LLM tooling optimizes execution. async-bulkhead-llm decides whether a request should run at all.
When a bounded queue is the right call
Fail-fast gets the good press. But there are real cases where letting requests wait is the better engineering decision.
Your fetch calls don't know when to stop
Outbound HTTP calls have no built-in concurrency limit. That's fine until a downstream dependency slows down and your service drowns in open connections.
p-limit doesn't tell you why it said no
Most concurrency libraries silently queue your work. A bulkhead rejects it, tells you why, and lets your system stay responsive under load.