When attempting to reinitialize replication you may experience one or both of the errors below
Message: ERROR 1805 (HY000) at line 1: Column count of mysql.user is wrong. Expected 45, found 42. The table is probably corrupted
ERROR 1146 (42S02) at line 1: Table 'mysql.servers' doesn't exist
Release : 9.3
Component : API GTW
The below command can be run on each node. This can upgrade and check/repair the mysql schema for errors.
mysql_upgrade -u root -p --force