Comments - Cluster node sizes are different
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Are you referring to wsrep_cluster_size status variable? No, this is not expected. What is the server version?
I mean the size of the same database (e.g. total tables content size in a database) in the three nodes are not the same The wsrep_cluster_size variable is 3 on the three nodes. I use CentOS7, and mysql version is Ver 15.1 Distrib 10.0.21-MariaDB.
Could you describe how are you measuring the content size? What is the storage engine for the tables?
I use innodb engine for tables, and using (du -sm *) in /var/lib/mysql to get all database sizes.
Can you provide the ls -lsR --block-size=1 /var/lib/mysql/* output from all 3 nodes, it is interesting where the difference is, there can be difference e.g. in error log size.