Galera Cluster vs Mysos: What are the differences?

<Galera Cluster vs. Mysos>

1. **Synchronous vs. Asynchronous Replication**: One key difference between Galera Cluster and Mysos is the replication method they use. Galera Cluster utilizes synchronous replication, ensuring that all changes are applied to all nodes at the same time, guaranteeing consistency. On the other hand, Mysos uses asynchronous replication, allowing for more flexibility in terms of delay in applying changes to nodes.
   
2. **Internal Load Balancing**: Galera Cluster has built-in internal load balancing, automatically distributing read and write queries across all nodes in the cluster. In contrast, Mysos relies on external load balancers for distributing requests, adding an additional layer of complexity in the setup and maintenance of the cluster.
   
3. **Automatic Data Rebalancing**: Galera Cluster handles data rebalancing automatically when a new node is added or removed from the cluster, ensuring even distribution of data across all nodes. Mysos, on the other hand, requires manual intervention for data rebalancing, which can be a more cumbersome process for administrators.
   
4. **Conflict Resolution Mechanism**: Galera Cluster uses a powerful built-in conflict resolution mechanism based on the certification-based optimistic replication model, handling conflicts efficiently. Mysos, on the other hand, relies on external conflict resolution tools or custom scripts, potentially leading to more complex conflict resolution processes.
   
5. **Supported Databases**: Galera Cluster primarily focuses on MySQL and MariaDB, offering full compatibility and integration with these database systems. In contrast, Mysos supports a broader range of databases beyond just MySQL and MariaDB, making it a more versatile solution for organizations with diverse database requirements.
   
6. **Community Support and Development**: Galera Cluster has a large community of users and developers contributing to its ongoing development and support, leading to frequent updates and enhancements. Mysos, while actively maintained, may have a smaller community, potentially impacting the speed and frequency of updates and support available.

In Summary, Galera Cluster and Mysos differ in their replication methods, internal load balancing, data rebalancing automation, conflict resolution mechanisms, supported databases, and community support. Galera Cluster offers synchronous replication, internal load balancing, automatic data rebalancing, advanced conflict resolution, focus on MySQL/MariaDB, and robust community support, while Mysos features asynchronous replication, external load balancers, manual data rebalancing, reliance on external conflict resolution tools, support for multiple databases, and potentially smaller community support.