Acking (Partially) Parallelly Processed Elements

Event sourcing with stream processing of events is great. It makes it possible to express your processing pipeline in a really natural way; it makes it easy to understand what processing steps are performed and in what order; and it allows for easily scaling up your processing pipeline, when properly done. Moreover, event streams allow for resiliency, and can be resumed in case of a crash or application restart. That last ...

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