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Synchronous Commands over Apache Kafka

« Kafka Summit 2020

You have built an event-driven system leveraging Apache Kafka. Now you face the challenge of integrating traditional synchronous request-response capabilities, such as user interaction, through an HTTP web service.

There are various techniques, each with advantages and disadvantages. This talk discusses multiple options on how to do a request-response over Kafka — showcasing producers and consumers using single and multiple topics, and more advanced considerations using the interactive queries of ksqlDB and Kafka Streams. Advanced considerations discussed:
• What a consumer rebalance means to your active request-responses.
• Discuss options for blocking for the async response in the web-service.
• How can the CQRS (Command Query Responsibility Segregation) be leveraged with the interactive state stores of Kafka Streams and ksqlDB?
• Interactive queries of the ksqlDB and Kafka Streams state stores are not available during a rebalance. What is the active Kafka development happening that will make interactive queries a more feasible option?
• Would a custom state store help with rebalancing limitations?
• Can custom partitioning be used for proper routing, and what impacts could that have to the other services in your ecosystem?
• We will explore the above considerations with an interactive quiz application built using Apache Kafka, Kafka Streams, and ksqlDB. With a proper implementation in place, your request-response application can scale and be performant along with handling all of the requests.

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