ksqlDB: The Link Between Real-Time Data and Big Data Streaming

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This post introduces ksqlDB as a bridge between real-time data and big data streaming, contrasting state-oriented and event-oriented architectures. It details how ksqlDB, as an event streaming database, allows for both immutable event logging and real-time querying of materialized views using SQL. It highlights the ability to perform both pull queries (to get the current state) and push queries (using EMIT CHANGES to continuously receive state updates) on event streams, demonstrating its capability to simplify architectures that require both event streaming and batch processing elements.