Galera Cluster

Orchestrator

MySQL replication topology management and HA

replication-manager

Signal 18 repman - Replication Manager for MySQL / MariaDB / Percona Server

mha4mysql-node

Development tree of Master High Availability Manager and tools for MySQL (MHA), Node (MySQL Server) part

Percona Replication Manager

This tool manages asynchronous replication between Percona XtraDB Cluster (PXC) or MariaDB clusters, enabling complex topologies like master-master links across multiple data centers. It leverages the existing Galera communication layer within clusters to coordinate replica election and failover, ensuring high availability and geographic distribution. ## Key Features - **Automatic Replica Election** — Nodes within a cluster coordinate via a shared table to elect a replica based on weight and local index, avoiding conflicts. - **Multi-Source Replication Support** — Handles scenarios where a cluster acts as a replica to multiple remote clusters, distributing replicas across nodes by default. - **Failover and Reconnection** — If a replica loses connection to its master, it attempts to reconnect to alternate masters; if unsuccessful, it reports a "Failed" state so another node can take over. - **GTID-Based Replication** — Works exclusively with GTID-based replication, supporting both Oracle MySQL and MariaDB implementations (with version-specific notes). - **Geo-Distributed Clusters** — Facilitates replication across geographically separated data centers using tools like booth for cluster coordination. ## Philosophy The project emphasizes automation and resilience in complex replication topologies, using a lightweight, agent-based approach that integrates seamlessly with existing Galera cluster communication to minimize overhead and simplify management.