Why it matters

Streaming needs shape efficient IO. fs2 is Cats ecosystem standard. Understanding shapes streaming Scala apps.

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The architecture

Stream[F, A]: stream of A in effect F.

Pull-based: consumer drives production.

fs2 characteristicsStream[F, A]effect + valuesPull-basedbackpressure naturalComposablemap/flatMap/etcZIO Streams is ZIO ecosystem equivalent
fs2 model.
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How it works end to end

Sources: reading files, TCP, database queries.

Sinks: writing files, TCP, DB updates.

Composability: transform, filter, chunk, parallelism.

Concurrency: parEvalMap, parJoin for concurrent processing.