The infrastructure about MySQL Master Slave replication involves:

  1. MySQL custom configuration
  2. MySQL custom recall
  3. Optimization and performance about point 1 and 2

Often there are open source that customizes MySQL recall, and it is not simple to adapt a MySQL Master Slave infrastructure. So that any simple idea is considered.

More open source uses user session, and table about session could be unique problem about a system of Master Slave replication with more slave.

Each slave could permit a read-only permission for each table excluding table session with these MySQL commands

grant select on database_name.* to 'mysql_user'@'localhost';
grant all on database_name.table_session to 'mysql_user'@'localhost';

Reference: mysql.com