MariaDB Enterprise Kubernetes Operator 26.06.3

MariaDB Enterprise Operator 26.06.3 is a maintenance release of MariaDB Enterprise Operator, released on 2026-09-09

Release date: 9 September 2026

MariaDB Enterprise Kubernetes Operator 26.06.3 is a maintenance release for the 26.06 series. It focuses on how semi-synchronous replication is applied across the nodes of a replication topology.

If you are updating from a previous version, please follow the UPDATE GUIDE to ensure a safe transition.

Changelog

• K8SDKR-311: Primary-side semi-synchronous replication is now managed per role instead of being left enabled in every node:

  • rpl_semi_sync_master_enabled is now converged to the role of each node on every reconciliation: enabled in the current primary, disabled in the replicas. It is still rendered as ON in the configuration file, so a node boots armed and the operator disables it in the replicas once it reconciles them. Previously it was left enabled in every node, so a replica binlogging the transactions it applied waited for an acknowledgement that could never arrive: with a high replication.semiSyncAckTimeout its apply thread parked indefinitely and replication stopped progressing.

  • replication.semiSyncWaitNoSlave now only takes effect where it is meaningful, in the primary, rather than acting as a cluster-wide policy. Keeping it ON, so that the primary never commits a transaction without a replica acknowledgement, no longer stalls the replicas.

  • New replication.semiSyncBootAsReplica field in the MariaDB resource. It renders read_only=ON and rpl_semi_sync_master_enabled=OFF in the configuration file, so that a node boots read-only and becomes writable only once the operator has enabled semi-synchronous replication on it. This closes the window in which a node that has just started is writable while unable to require a replica acknowledgement. It is disabled by default, and while it is enabled a restarted primary stays read-only until the operator reconciles it. Using this field requires the data-plane to be updated to 26.6.3.

Platform and component versions

The current release has been tested with the following versions:

Platform/Component	Version
Kubernetes	1.36
OpenShift	4.20
MariaDB Enterprise Server	11.8.8-5
MaxScale	25.10.3

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