Cluster system and the Split-BrainSyndrome detection method

摘要

PROBLEM TO BE SOLVED: To detect and resolve a Split-Brain Syndrome when a cluster is divided into a plurality of clusters by a path fault, etc.SOLUTION: A plurality of nodes 1 configuring a cluster comprise: a privilege node selection unit 114 for securing, by applying a Paxos algorithm for guaranteeing that agreement is reached by one proposal in a flow of a series of algorithms up to the completion thereof, a privilege node right period in which only the proposal of the node itself is passed by setting an update interval so that a lease period used in Master Lease will not be disconnected, the node itself proposing that it is a privilege node capable of updating a node management table 121 and obtaining agreement thereon; and a cluster disengagement designation unit 115 for determining, if two or more consecutive proposals were made and the proposals were rejected twice in succession before the flow of a series of Paxos algorithms was completed, or if responses could not be collected from more than half, that a Split-Brain Syndrome has occurred.