The wsrep API is a generic replication plugin interface for databases. This parameter enables the automatic adjustment of auto increment system variables with changes in cluster membership. The MySQL-wsrep patch for MySQL Server and MariaDB Server developed by Codership. The wsrep API (write set replication API) defines the interface between Galera replication and MariaDB. wsrep (stands for Write Set REPlication) is an effort to research and develop a generic pluggable replication API for DBMS-like applications. wsrep API defines a set of application callbacks and replication library calls necessary to implement synchronous writeset replication of transactional databases.