Disclaimer

This article is the author’s opinion on similarities and differences between Streaming and Messaging.

Streaming and Messaging

The first time I was busy with the terms messaging and streaming was during my master thesis in 2016. Among other things, the thesis was about different strategies of microservices integration. During that time, the term messaging was popular. Moroever, Kafka, which is a streaming platform, was popular, too. From a high-level perspective, messaging, kafka and streaming seem to be the same thing… but I never understood, why we have these two terms which are used synonymously in many contexts: messaging and streaming. This article is my answer to that question.

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Last summer I watched the Red Hat master course about Kafka from Sébastien Blanc. The Kafka setup in Kubernetes presented in the course looked pretty easy. The Kafka client implementation for Java seemed to be easy as well. Furthermore, I wanted to use Kafka for a long time, so I got the idea to extend my Istio example. Each time a service is called, a message is sent to a topic. The service (implemented in Quarkus), as well as the Kafka cluster should be in an Istio Service Mesh and secured with mTLS. I found descriptions of Joel Takvorian that Kafka works with Istio, so I knew (or at least hoped) that my plan should work.

This article will describe the overall architecture of the example and which obstacles I encountered during deployment.

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