Answer
Non-blocking async programming using data streams.
Frameworks: Reactor, RxJava, Spring WebFlux.
Quick Answer
Reactive programming is a paradigm that deals with async data streams. In microservices context it means building services that are non-blocking end-to-end - from HTTP request to DB query to response. Libraries: Project Reactor (Spring WebFlux), RxJava. Benefit: a small thread pool handles thousands of concurrent requests since threads are never blocked waiting.
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Verified Answer
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Source: SugharaIQ