CEP-21: Practical Guide to TCM - New Paxos Based Metadata Manager

​Get a practical operator's guide to the most significant change in Cassandra 6: Transactional Cluster Metadata (TCM). TCM (CEP-21) replaces the legacy gossip-based metadata manager with a reliable, Paxos-backed distributed log, finally eliminating split-brain risks and inconsistent schema propagation. Patrick McFadin will provide a deep dive into the technical changes, walk through the crucial three-phase upgrade path, and demonstrate how day-to-day operations like node bootstrap and schema changes become faster and much safer. We'll also cover essential production topics: CMS sizing, monitoring, and a concrete testing checklist. This is a must-attend talk for anyone running or planning to upgrade Cassandra clusters who wants to master operating with TCM.-----LinkedIn Post

​Massive Change in Cassandra 6 Alert! Join us for a deep dive into CEP-21: Transactional Cluster Metadata (TCM).

​Patrick McFadin is presenting a Practical Guide to TCM—the new Paxos-based metadata manager that is fundamentally changing how Cassandra clusters operate.

​TCM is designed to eliminate major operational pain points:

• ​❌ Split-brain risk during topology changes.

• ​❌ Inconsistent schema propagation.

• ​❌ Ring-settle guesswork.

​Learn how to plan for the three-phase upgrade, perform safer operations (like bootstrap & decommission), and get essential knowledge on CMS sizing, monitoring, and failure playbooks for production.

​If you operate Cassandra clusters, this is the session to help you successfully transition and thrive with TCM.