High Availability Support in CORBA Environments
SOFSEM '97 Proceedings of the 24th Seminar on Current Trends in Theory and Practice of Informatics: Theory and Practice of Informatics
A Synchronisation Mechanism for Replicated Objects
SOFSEM '98 Proceedings of the 25th Conference on Current Trends in Theory and Practice of Informatics: Theory and Practice of Informatics
Garbage Collection for Modile and Replicated Objects
SOFSEM '99 Proceedings of the 26th Conference on Current Trends in Theory and Practice of Informatics on Theory and Practice of Informatics
ROI: An Invocation Mechanism for Replicated Objects
SRDS '98 Proceedings of the The 17th IEEE Symposium on Reliable Distributed Systems
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The Hidra Membership Monitor (HMM) is a distributed service that maintains the current set of active nodes in a cluster of machines. This protocol allows the detection of multiple machine joins or failures in a unique reconfiguration, using a low amount of messages (with a cost that is linear on the number of nodes). These membership services are needed to detect cluster changes as soon as possible, initiating then the reconfiguration of the cluster state, where support for replicated objects has been included. The HMM also manages and synchronises the reconfiguration steps needed by the kernel and Hidra components of each node, ensuring that all of them take the same steps at once. Thus, our system does not need an atomic multicast protocol to deliver the messages in these reconfiguration steps. All these services provide the basis to develop reliable intracluster transport protocols and to reduce the reconfiguration time of replicated objects and services.