LDAP Directory Template Model on Multi-master Replication

LDAP Multi-Master Technique is a replication approach using Syncrepl to replicate data to multiple servers. As the specialized database optimized for read access, the directory is used to represent heterogeneous entities in directory information tree (DIT). Compared with existing Sync replication models, the directory template replication model based on query templates proposed in this paper only replicates the entries matching the template specification. Replicated templates can reduce the complexity of the query containment problem and generalize the user queries corresponding to semantic regions demonstrating locality of reference. The synchronization protocol, which uses standard means of extending LDAP, is used to support (N-way) Multi-Master server replication modes. In this case, masters can be located in several physical sites, and other masters will continue the database if one master fails. Finally, we demonstrate the advantages of the novel model considering higher hit rates and the large update traffic with an experimental study based on real data and a prototype implementation of the LDAP directory cache.