Unification of Transactions and Replication in Three-Tier Architectures Based on CORBA
IEEE Transactions on Dependable and Secure Computing
Fully Distributed Three-Tier Active Software Replication
IEEE Transactions on Parallel and Distributed Systems
Showing correctness of a replication algorithm in a component based system
IDEAS '08 Proceedings of the 2008 international symposium on Database engineering & applications
Replication-aware transactions: how to roll a transaction over failures
Ada-Europe'06 Proceedings of the 11th Ada-Europe international conference on Reliable Software Technologies
Integrating fault tolerance and load balancing in distributed systems based on CORBA
EDCC'05 Proceedings of the 5th European conference on Dependable Computing
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In this paper we describe a software infrastructure that unifies replication and transaction processing in three-tier architectures and, thus, provides high availability and fault tolerance for enterprise applications. The infrastructure is based on the Fault Tolerant CORBA and CORBA Object Transaction Service standards, and works with commercial-off-the-shelf application servers and database systems.The infrastructure replicates the application servers to protect the business logic processing. In addition, it replicates the transaction coordinator, which renders the two-phasecommit protocol non-blocking and, thus, avoids potentially long service disruptions caused by coordinator failure. The infrastructure handles the interactions between the application servers and the database servers through replicated gateways that prevent duplicate requests fromreaching the database servers. The infrastructure implements client-side automatic failover mechanisms, which guarantees that clients know the outcome of the requests that they have made. The infrastructure starts the transactions at the application servers, and retries aborted transactions, caused by process or communication failures, automatically on the behalf of the clients.