Replaying events using Kafka streams

If a Kafka-persisted source runs in a separate application from the associated logic (windows, CQs, caches, WActionStores, targets), the latter application can safely be brought down for maintenance or updates. When it is restarted, the application will automatically replay the Kafka stream from the point it left off, with zero loss of data and no duplicates.

See Introducing Kafka streams for more information.