In this section, we discuss changes in the implementation of MySQL Cluster in MySQL 5.0 as compared to MySQL 4.1. We will also discuss our roadmap for further improvements to MySQL Cluster as currently planned for MySQL 5.1.

There are relatively few changes between the NDB Cluster storage engine implementations in MySQL 4.1 and in 5.0, so the upgrade path should be relatively quick and painless.

All significantly new features being developed for MySQL Cluster are going into the MySQL Cluster NDB 6.x trees. For information on changes in the Cluster implementations in MySQL versions 5.1 and later, see MySQL Cluster NDB 6.X/7.X.