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Kappa architecture.

Streaming only: one stream processor over an immutable log with long retention; to reprocess, replay the log through a new version.

the two-minute refresher

Everything is a stream; there is one codebase.
Bug fix or new logic: start a new processor from the beginning, catch up, switch outputs, delete the old.
Needs long log retention and a processor fast enough to replay history.

Where the course teaches it

W08 · Day 2Streaming vs Batch Processinglearn it →W08 · Day 2Streaming vs Batch Processingrevisit →

Related concepts

Lambda architecture
Event time