Document new wsrep_mode system variable for Galera in 10.6

Two new features for Galera

• Write a warning to error log if Galera replicates InnoDB table with no primary key
• Write a warning to error log if Galera replicates a table with storage engine not supported by Galera

Rules

• Write a warning to error log if Galera replicates table with storage engine not supported by Galera (at the moment only InnoDB is supported if log_warnings > 1
  • Warning is pushed to client also
  • MyISAM is allowed if wsrep_replicate_myisam=ON
• Write a warning to error log if Galera replicates table with no primary key if log_warnings > 1
  • Warning is pushed to client also
  • MyISAM is allowed if wsrep_relicate_myisam=ON
• In both cases apply flood control if >= 10 same warning is writen to error log (requires log_warnings > 1), flood control will suppress warnings for 300 seconds