Recently we needed to choose a stream processing framework for processing CDC events on Kafka. CDC events were produced by a legacy system and the resulting state would persist in a Neo4J graph database. We had to choose between, Spark Streaming, Kafka Streams and Alpakka Kafka. …

Introduction Scrum definition has gone through a major transformation. The Scrum PLOP (www.scrumplop.org) which can be considered as the new de-facto Scrum standard, lists many many organizational patterns which are observed in successful Scrum teams. People who are used to simple explanation of Scrum will find this drastically different. …

In last few years Domain Driven Design has resurrected in the context of MicroServices. A lot of books advocate use of Bounded Contexts decide Microservice boundaries. While Bounded Contexts is good for identifying broader grouping of services, when developing Service APIs, it’s generally guided by another very important concept called…

Akka Actors is a very popular and widely used framework which implements Actors (or for simplicity, lightweight threads) on the JVM. To understand how Actors work, and how they are mapped to JVM threads we created a tiny Actor framework of our own, similar to Akka Actors. …

JVM thread maps to OS thread is a commonly read statement. But what does it really mean?. We create Thread object in java and call its start method to start new thread. How does it start OS thread? …

​1.​ Introduction Reactive programming, particularly for writing web services is getting a lot of attention in last few years. It’s changing the way programmers have to write code, and what they assume about the underlying threading mechanisms. Most web servers used to use thread per connection model to handle http requests. In…

Service Discovery is a mechanism to resolve the address of a service we want to communicate to. In last few years, with the rise of container technology, service discovery mechanisms have become key architectural component of the production infrastructure. While building infrastructure services for Thirty Meter Telescope(www.tmt.org), we had a…