Hi Robert, Thank you for your reply. To be honest, we don't currently have enough people who can actively maintain and develop the ClickHouse connector. That's exactly why I sent the email — hoping to find interested contributors through the community discussion.
Given the lack of responses for a while, I suspect the discussion may not have attracted enough interest. Thank you for the helpful advice! Best regards, Chanhae Oh ________________________________ From: Robert Metzger <[email protected]> Sent: Friday, June 5, 2026 22:20 To: [email protected] <[email protected]> Subject: Re: [DISCUSS] Reviving FLIP-202: Introducing ClickHouse Connector for Apache Flink Thanks a lot for the proposal! The problem for the Flink community is that we don't want to have too many connectors which are only maintained by a single person or entity. It's a bit of a chicken and egg problem: With an apache repo, its easier for a community to build around a connector .. but we are not really willing to create a repo if there's not at few people behind a connector. Are you aware of a set of people who are interested in maintaining the connector? On Mon, Apr 20, 2026 at 6:02 PM 오찬해 <[email protected]> wrote: > Hi Flink community, > > I'd like to revive the discussion around FLIP-202, which proposes > introducing a native ClickHouse Connector for Apache Flink. > > The original FLIP was authored by RocMarshal and later picked up by > ConradJam in August 2023. As there have been no recent updates, > I'd like to take this opportunity to bring it back to the community's > attention and help move the discussion forward. > > --- > > ## Background & Motivation > > I currently have a real production need for a secure and stable > ClickHouse connection with Flink, which motivated me to explore > this area more deeply. > > While investigating, I found that: > > - The existing unofficial flink-clickhouse-connector relies on an > unmaintained JDBC dependency, which poses reliability and > security risks > - ClickHouse now officially supports JDBC v2, which is actively > maintained and significantly more robust than the previous driver > - ClickHouse adoption has grown considerably since the original > FLIP was proposed, making this connector increasingly relevant > to the community > > Based on this, I have been working on a fork that migrates the > implementation to use the official ClickHouse JDBC v2 driver > (0.9.7) and adds compatibility with Flink 2.0.1: > > https://github.com/och5351/flink-connector-clickhouse/tree/feature/flink-201-clickhouse-097 > > The current implementation is not yet perfect, but it is > functional and serves as a solid starting point. I plan to > continue refining and improving it through community contributions > as the discussion progresses. > > --- > > ## What I'd Like to Discuss > > Based on the previous discussion and my current work, I'd like > to raise the following questions for the community: > > 1. **Reviving FLIP-202** > Is the community open to restarting the FLIP-202 discussion > with updated content that reflects: > - The current Flink connector API > - The official ClickHouse JDBC v2 driver (0.9.7) > - Flink 2.x compatibility > > 2. **Integration into flink-connector-jdbc** > Given the JDBC-based implementation, is there a possibility > of integrating the ClickHouse connector into > flink-connector-jdbc rather than maintaining a separate > repository? > > 3. **Standalone external repository** > If a separate repository is preferred, would the community > support establishing flink-connector-clickhouse as an > official standalone external connector? > > --- > > ## Why Now > > - ClickHouse has grown significantly in adoption since 2023 > and is widely used in real-time analytics workloads > - ClickHouse now officially supports JDBC v2, making this > a great opportunity to build the connector on a > well-maintained and future-proof foundation > - Flink 2.x introduces new APIs that make this a good time > to design the connector on a solid foundation > - There is clear community interest based on the previous > discussion thread (FLIP-202, FLINK-26999) > > --- > > I'd love to hear thoughts from the community, especially from > those who were involved in the original discussion: > > cc: RocMarshal, ConradJam, Martijn Visser, > Kanthi Subramanian, Robert Metzger > > Original FLIP-202: > https://cwiki.apache.org/confluence/display/FLINK/FLIP-202 > > Jira Ticket (FLINK-26999): > https://issues.apache.org/jira/browse/FLINK-26999 > > My current fork for reference: > > https://github.com/och5351/flink-connector-clickhouse/tree/feature/flink-201-clickhouse-097 > > Looking forward to the discussion! > > Best regards, > Chanhae Oh >
