Comments - Mariadb DB Replication 4 Nodes as Master to Master
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One thing to note is that Galera is not a true multi-master solution and the main benefit of it are the resilience and auto-recovery of the cluster. Writes should still only happen on one node at a time to prevent conflicts on commit. Using something like MaxScale can make this easier as it automatically spreads the read workload to all nodes while still focusing writes to a single node.
A solution for write scaling would be something like MariaDB Xpand that is designed for parallel writes.