June 2025 ClickHouse Newsletter

June 2025 ClickHouse Newsletter

Introduction

Welcome to the June 2025 ClickHouse newsletter! This month, we are excited to announce ClickStack, our new open-source observability solution. This innovative tool enhances learning about data processes, allowing users to explore analytics in depth. Additionally, you will discover insights about the mark cache, how the CloudQuery team constructed a full-text search engine with ClickHouse, the development of agentic applications using the MCP Server, and much more!

Featured Community Member: Joe Karlsson

This month's featured community member is Joe Karlsson, a Senior Developer Advocate at CloudQuery. Joe brings over five years of experience in fostering developer communities around advanced data technologies. Having progressed through significant roles at MongoDB, SingleStore, and Tinybird, he currently specializes in creating educational resources that empower developers in leveraging modern data infrastructure tools.

Known for his prolific writing, Joe covers a broad range of topics in data engineering, including Kubernetes asset tracing and querying cloud infrastructure for expired dependencies. His hands-on experience with ClickHouse is evident in his contributions, especially in articles such as How We Handle Billion-Row ClickHouse Inserts With UUID Range Bucketing and Six Months with ClickHouse at CloudQuery (The Good, The Bad, and the Unexpected). ➡️ Follow Joe on LinkedIn for more insights!

Upcoming Events

ClickHouse, observability, community, data technology, training

Mark your calendars for exciting events this month! We have the v25.6 Community Call scheduled for June 26 and several free training options, including the ClickHouse Admin Workshop (Virtual) on June 25 and in-person ClickHouse Query Optimization Training in Bangalore on June 26. The series of training sessions will continue with the ClickHouse Deep Dive Training on July 2, followed by a BigQuery to ClickHouse Workshop on July 9.

For those in America, the ClickHouse Meetup will occur in Atlanta on July 8, while New York will host a ClickHouse Social on July 15. Additionally, various AWS Summits are planned, including the ones in New York on July 16 and in Toronto on September 4. Don't miss out on these opportunities for growth and learning!

ClickHouse 25.5 Release

This month also marks the release of ClickHouse 25.5, where the vector similarity index has graduated from experimental status to beta. Significant improvements include Hive metastore catalog support, easier use of clickhouse-local by allowing stdin to skip FROM and SELECT clauses, and enhancements to the Parquet reader for handling Geo types. Take advantage of these updates to enhance your data analytics.

Conclusion

The June 2025 ClickHouse newsletter showcases the incredible advancements in observability with ClickStack and further highlights the compelling contributions from community members like Joe Karlsson. These innovations are not only about technology but also about learning how to harness them for practical applications. The upcoming events present an excellent chance for everyone to engage deeply with ClickHouse's capabilities, fostering an environment of discipline, growth, and persistence. We look forward to seeing you at these events!

ClickHouse, observability, community, data technology, training

Questions and Answers

Q: What is ClickStack?
A: ClickStack is ClickHouse's new open-source observability solution offering features for logs, metrics, traces, and session replay.

Q: Who is Joe Karlsson?
A: Joe Karlsson is a Senior Developer Advocate at CloudQuery, specializing in technical content and community engagement around data technologies.

Q: When is the next community call?
A: The v25.6 Community Call is scheduled for June 26.

Q: What significant feature was introduced in ClickHouse 25.5?
A: The vector similarity index has moved to beta status, alongside several practical enhancements to functionality.

Q: How can I follow the newsletter updates?
A: Keep an eye on the ClickHouse website for the latest advancements, blog posts, and upcoming events in the community!

tags:ClickHouse, observability, community, data technology, training

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