Episode 433: Jay Kreps on ksqlDB

Kafka: An Event Streaming Platform

Kafka is an event streaming platform that allows users to read and write streams of events, such as business activities or sales. It acts as a distributed cluster, storing events in a linear stream-like array. Kafka has gained popularity for building real-time, low-latency data pipelines and asynchronous event-driven microservices. It offers APIs for producing and consuming data, as well as pre-built connectors for different systems and applications.

Kafka Topics and Event Processing

In Kafka, a topic is a data stream where events are published or appended to an array-like structure. Topics can trigger various backend activities based on the events published, such as order fulfillment, customer updates, or analytical reporting. Kafka's event-driven processing supports operations like real-time aggregation, joining streams, filtering, and reacting to events. By combining streams from different sources and tables, users can perform complex analyses and transformations, such as aggregating sales data or joining customer information.

KSQL DB: Stream Processing with SQL

KSQL DB is a stream processing tool that allows users to query, transform, and analyze real-time data streams using SQL-like queries. It brings together the concepts of streams and tables, enabling users to perform continuous computations on event data. KSQL DB supports both pull and push queries, allowing users to retrieve data in real-time or subscribe to ongoing data changes. It works on top of Kafka, leveraging Kafka Connectors for capturing or publishing data to various systems. KSQL DB provides a simplified and end-to-end solution for stream processing, eliminating the need for custom code and integration between different technologies.

The Power of Push Queries in Stream Processing

The podcast episode highlights the significance of push queries in stream processing. While pull queries can be performed by numerous databases, the true value lies in push queries, which is a unique feature in stream processing. The speaker emphasizes that now is the best time to learn about push queries with InterSystems Iris, as it allows for the development of data-intensive and mission-critical applications. By connecting systems, using any data model, and applying machine learning, InnerSystems Iris empowers users to build applications according to their desired specifications.

The Architecture and Scalability of ksqlDB

In this part of the podcast, the speaker discusses the architecture and scalability of ksqlDB. The system follows a traditional database architecture, with a commit log in Kafka and materialized tables in the ksqlDB cluster. Nodes in the ksqlDB cluster read and write streams of data from Kafka, materializing them into RocksDB, an embedded key-value store that maintains the data format on disk. This approach allows for elastic scalability, with the ability to add or remove nodes dynamically. Additionally, ksqlDB offers fault-tolerance through data replication and utilizes Kafka for the long-term storage of all data.

Software Engineering Radio - the podcast for professional software developers

Episode 433: Jay Kreps on ksqlDB

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Quick takeaways

Deep dives

Kafka: An Event Streaming Platform

Kafka Topics and Event Processing

KSQL DB: Stream Processing with SQL

The Power of Push Queries in Stream Processing

The Architecture and Scalability of ksqlDB

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Software Engineering Radio - the podcast for professional software developers

Episode 433: Jay Kreps on ksqlDB

Podcast summary created with Snipd AI

Quick takeaways

Deep dives

Kafka: An Event Streaming Platform

Kafka Topics and Event Processing

KSQL DB: Stream Processing with SQL

The Power of Push Queries in Stream Processing

The Architecture and Scalability of ksqlDB

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