Open Source Summit + ELC Europe 2018

Kafka Streams is a flexible and powerful framework. The Domain Specific Language (DSL) is an obvious place from which to start, but not all requirements fit the DSL model.

Many people are unaware of the Processor API (PAPI) - or are intimidated by it because of sinks, sources, edges and stores - oh my! But most of the power of the PAPI can be leveraged, simply through the DSL `#process` method, which lets you attach the general building block `Processor` interface to your -easy to use- DSL topology, to combine the best of both worlds.

This talk will look at the flexibility of the DSL’s process method and the possibilities it opens up. We’ll use real world use-cases borne from extensive experience from users to explore power of direct write access to the state stores and performing range sub-selects. The options that punctuators bring to the table, as well as opportunities for major latency optimisations.