Migration Archives - Kai Waehner

The Strangler Fig Design Pattern - Migration and Replacement of Legacy IT Applications with Data Streaming using Apache Kafka

1.1K views
8 minute read

Replacing Legacy Systems, One Step at a Time with Data Streaming: The Strangler Fig Approach

ByKai Waehner
27. March 2025

Modernizing legacy systems doesn’t have to mean a risky big-bang rewrite. This blog explores how the Strangler Fig Pattern, when combined with data streaming, enables gradual, low-risk transformation—unlocking real-time capabilities, reducing complexity, and supporting scalable, cloud-native architectures. Discover how leading organizations are using this approach to migrate at their own pace, stay compliant, and enable new business models. Plus, why Reverse ETL falls short and streaming is the future of IT modernization.

3.3K views
5 minute read

Multi-Cloud Replication in Real-Time with Apache Kafka and Cluster Linking

ByKai Waehner
14. August 2024

Multiple Apache Kafka clusters are the norm; not an exception anymore. Hybrid integration and multi-cloud replication for migration or disaster recovery are common use cases. This blog post explores a real-world success story from financial services around the transition of a large traditional bank from on-premise data centers into the public cloud for multi-cloud data sharing between AWS and Azure.

One Apache Kafka Cluster Type Does NOT Fit All Use Cases

4.6K views
13 minute read

Apache Kafka Cluster Type Deployment Strategies

ByKai Waehner
29. July 2024

Organizations start their data streaming adoption with a single Apache Kafka cluster to deploy the first use cases. The need for group-wide data governance and security but different SLAs, latency, and infrastructure requirements introduce new Kafka clusters. Multiple Kafka clusters are the norm, not an exception. Use cases include hybrid integration, aggregation, migration, and disaster recovery. This blog post explores real-world success stories and cluster strategies for different Kafka deployments across industries.

JMS Message Broker vs Apache Kafka Data Streaming

11.0K views
6 minute read

Message Broker and Apache Kafka: Trade-Offs, Integration, Migration

ByKai Waehner
2. March 2023

A Message broker has very different characteristics and use cases than a data streaming platform like Apache Kafka. Data integration, processing, governance, and security must be reliable and scalable across the business process. This blog post explores the capabilities of message brokers, the relation to the JMS standard, trade-offs compared to data streaming with Apache Kafka, and typical integration and migration scenarios.

SIEM and SOAR Modernization with Apache Kafka Elasticsearch Splunk QRadar Arcsight Cortex

7.6K views
10 minute read

Kafka for Cybersecurity (Part 6 of 6) – SIEM / SOAR Modernization

ByKai Waehner
9. August 2021

This blog series explores use cases and architectures for Apache Kafka in the cybersecurity space, including situational awareness, threat intelligence, forensics, air-gapped and zero trust environments, and SIEM / SOAR modernization. This post is part six: SIEM / SOAR modernization and integration.