Comments - Replication feasibility check
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The slave should usually be the higher version, so 10.0->10.3 should work. The reverse will most likely give problems. See https://mariadb.com/kb/en/library/mariadb-vs-mysql-compatibility/#replication-compatibility and as well as the upgrading articles at https://mariadb.com/kb/en/library/upgrading/ for incompatibilities with the newer versions.