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Microservices Architecture · Microservices Communication: REST, Events and the API Gateway

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Trick to keep in mind+3 XP

Every outbound call needs a deadline: waiting is what a thread does worst.

Without a timeout, a request waits on a stuck dependency indefinitely, and the thread or connection it occupies is unavailable to anyone else. A handful of these empties the pool, callers further up queue behind them, and a healthy service looks dead. Cap each wait below what your own caller will tolerate.

Read it once, then a question tests whether the trick stuck.