Strongly consistent replication and recovery of fault-tolerant CORBA applications.

Abstract

The Eternal system provides transparent fault tolerance for CORBA applications, without requiring the modification of either the application or the ORB. Eternal replicates the application objects, and ensures strong replica consistency by employing a reliable totally-ordered multicast protocol for conveying the IIOP messages of the application. To achieve strong replica consistency during recovery, Eternal retrieves and transfers the three kinds of state -- applicationlevel state, ORB/POA-level state and infrastructure-level state -- from an existing replica to a new or recovering replica, and logs and replays messages.