Reactive Streams · interview question
What important behavior can flatMap() introduce into a Reactor pipeline?
Multiple choiceMediumchapter-19-curatedpremiumreactive-streamsfunctional-pipelines-flatmap
Answer and explanation
Correct answer
D. Concurrent inner execution that may reorder results.
Why
flatMap() can run multiple asynchronous inner operations concurrently and merge their results as they arrive. That means it can improve throughput, but it can also reorder outputs unless ordering is restored deliberately.
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