Quorum-Based Locking Protocol in Nested Invocations of Methods
DEXA '01 Proceedings of the 12th International Conference on Database and Expert Systems Applications
Quorum-Based Protocol for Locking Replicas of Objects
ICCNMC '01 Proceedings of the 2001 International Conference on Computer Networks and Mobile Computing (ICCNMC'01)
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In object-based systems, objects supporting abstract methods are replicated to increase the performance, reliability, and availability. We discuss a novel object-based locking (OBL) protocol to lock replicas of objects by extending the quorum-based protocol for read and write to abstract methods. Unless two methods conflict, subsets of the replicas locked by the methods do not intersect even if the methods change the replicas. Methods not computed on a replica $A$ but computed on another replica are computed on $A$ when a method conflicting with the methods are issued to $A$ in the $OBL$ protocol. We newly propose a version vector to identify what methods are computed on a replica.