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14th International Conference on Distributed Computing Systems (1994)
Pozman, Poland
June 21, 1994 to June 24, 1994
ISBN: 0-8186-5840-1
pp: 536-543
J.-F. Paris , Dept. of Comput. Sci., Houston Univ., TX, USA
We propose a highly available replication control protocol tailored to environments where network partitions are always the result of a gateway failure. Our protocol divides nodes holding replicas into local nodes that can communicate directly with each other and non-local nodes that communicate with other nodes through one or more gateways. While local nodes are assumed to remain up to date as long as they don't crash, non-local nodes are required to maintain a volatile witness on the same network segment as the local nodes and must poll this witness before answering any user request. To speed up recovery from a total failure, each site maintains a list of replicas that were available the last time the data were updated or a replica recovered from a crash. Markov models are used to compare the performance of our protocol with that of the dynamic-linear voting protocol (DLV), which is the best replication control protocol tolerating communication failures. We also observe that volatile witness placement has a strong impact on data availability and gateway nodes are the best location for them.<>
distributed databases, software reliability, system recovery, fault tolerant computing, protocols, storage management, network operating systems, data integrity

J. Paris, "A highly available replication control protocol using volatile witnesses," 14th International Conference on Distributed Computing Systems(ICDCS), Pozman, Poland, 1994, pp. 536-543.
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