Release notes v2.3.4

Release highlights

Release statusNew featuresImprovementsDeprecationsLimitationsUpgrade instructions

• Version name: ClusterControl 2.3.4
• State: Latest
• First release date: October 7^th, 2025
• Maintenance status: Active
• Total maintenance builds: 2
• Last release date: N/A

• Support for MySQL Group Replication (Oracle).
• Support for Percona Server Pro 8.4.
• Support for Redis 8.
• Support for PostgreSQL 18.
• CMON controller pool for ClusterControl scalability (Tech Preview).

• Restore external and partial backups operations for MySQL and PostgreSQL.
• PostgreSQL custom data directory - Use any custom data directory location for your database nodes.

• Drop support for new cluster deployments for MariaDB-related clusters 10.4 and older.
• "Enable TimescaleDB" as an PostgreSQL action/job has been deprecated.

• PostgreSQL 18
  • Major upgrade from PostgreSQL 17 to 18 is not currently supported.
  • Import existing PostgreSQL 18 is not currently supported.
  • Only for streaming replication.
• Early preview release of CMON controller pool only supports multiple controller pools co-located on a same host.

1. Follow standard upgrade procedures as outlined in the documentation.

Maintenance Release: October 24^th, 2025

• Build:

  • clustercontrol-controller-2.3.4-16604

• Controller:

  • Address an issue to update an expired repository GPG key for MySQL (CLUS-6604)

Maintenance Release: October 23^rd, 2025

• Build:

  • clustercontrol-controller-2.3.4-16591
  • clustercontrol-mcc-2.3.4-626
  • clustercontrol2-2.3.4-2151

• Controller:

  • Address an issue with supported versions for TimescaleDB. Only available with PostgreSQL 16 (not 17 or 18 at the moment) (CLUS-6589)
  • Address an issue with node removal with Redis / Valkey cluster (CLUS-6464)
  • Address an issue when upgrading CMON 2.3.1 to 2.3.4 during DB migration (CLUS-6559)
  • Address an issue with pg_BackRest when the env MODULSHOME is used (CLUS-6562)
  • Address an issue with partial backup restore with pg_dump when using sudo user (CLUS-6538)
  • Address an improvement to support LDAP_OPT_REFERRALS with LDAP (CLUS-6355)
  • Address an issue with running CMON jobs being purged (CLUS-6520)
  • Address an improvement to support Redis 8 (CLUS-6496)
  • Address an improvement to support PostgreSQL 18 (CLUS-6497)
  • Limitations (will be addressed with a future patch):
    • Major upgrade from 17 to 18 is not currently supported
    • Logical Replication Deployments / Imports is not currently supported

• UI:

  • Enable TimescaleDB as an PostgreSQL action/job has been deprecated - not supported. Please deploy a TimescaleDB cluster or manually enable the extension if required (CLUS-6598)
  • Address an issue with the tooltip for pg_dumpall (CLUS-6582)
  • Address an issue with Query Monitor / Agents with Group Replication (CLUS-6525)
  • Address an issue with missing ‘bootstrap’ option when restoring MySQL backups (CLUS-6513)
  • Address an issue with PostgreSQL backup schedules where ‘verify backup’ option was not persisted/correctly set (CLUS-6535)
  • Address an issue with missing partial backup options when selecting ‘mariadb-dump’ as backup method (CLUS-6485)
  • Address an issue with a broken cluster list filter dialog (CLUS-6500)
  • Address minor cosmetic with the CMON pool wizard and UI (CLUS-6435, CLUS-6507, CLUS-6577)

Initial Release: October 7^th, 2025

• Build:
  • clustercontrol2-2.3.4-2138
  • clustercontrol-mcc-2.3.4-604
  • clustercontrol-controller-2.3.4-16304
  • clustercontrol-kuber-proxy-0.1.0-589
  • clustercontrol-proxy-2.3.4-129
  • clustercontrol-cloud-2.3.4-446
  • clustercontrol-clud-2.3.4-446
  • clustercontrol-notifications-2.3.4-388
  • clustercontrol-ssh-2.3.4-229
  • s9s-tools 1.9.2025100911

We’re pleased to announce the release of ClusterControl v2.3.4 which adds support for:

• MySQL Group Replication for native multi-primary HA
• Percona Server Pro 8.4
• Backup and restore improvements specifically with external and partial backups for MySQL/PostgreSQL
• Preview of a scalable CMON Controller pool

Features

MySQL Group Replication

Whether you’re building a high-availability service or planning for zero-downtime operations, Group Replication offers a robust MySQL-native solution that minimizes operational overhead while maximizing resilience:

• Automatic failover with built-in consensus-based membership and leader election.
• Synchronous replication using Paxos-like protocols to ensure strong consistency across nodes.
• Multi-primary support for concurrent writes on multiple nodes with conflict detection.
• Seamless scaling of reads and writes without manual topology management.
• Self-healing clusters, with automatic member rejoin and state reconciliation.
• Load balancing, with HAProxy and Keepalived for high availability routing.

Backup and Restore

• Restore external backup
  • Various improvements / fixes for MySQL Replication & PostgreSQL
• Partial Backup & Restore
  • Supported now with Percona Xtrabackup, MariaDB mariadb-backup and pg_dump

Scaling and High Availability - ClusterControl CMON Controller Pool

This update brings a preview of CMON controller pooling, dynamic cluster assignment, and Kubernetes-native configuration storage for K8s and non-K8s environments.

• Controller Pooling: You can now run multiple collocated controllers (on the same or different hosts) with isolated configs and coordinated cluster ownership.
• Cluster Auto-Assignment: Clusters are dynamically and transactionally assigned across active controllers. The system ensures no cluster is ever left orphaned. Ensures zero downtime and failover with minimal manual intervention
• Graceful Scaling: When scaling your controller pool up/down, CC automatically redistributes clusters while preserving service continuity.

Miscellaneous

• Support for Percona Server Pro 8.4