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State machine replication

In computer science, state machine replication (SMR) or state machine approach is a general method for implementing a fault-tolerant service by replicating servers and coordinating client interactions with server replicas. The approach also provides a framework for understanding and designing replication management protocols.

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The State Machine Approach

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State machine replication

Nodes25
Edges24
Triples11
Avg. degree1.92
Density0.08
Components1

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state replicas system may machine replica inputs output log order outputs client server input used new must reconfiguration transfer approach

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SubjectPredicateObjectConfidenceSrc
memory errors or hard-drive crashinstance ofSpecial cases can improve these bounds.All of this deduction pre-supposes that replicas are experiencing only random independent faults0.80text
Logginginstance ofsee Auditing and Failure Detection.The appendix contains discussion on typical extensions used in real-world systems0.80text
Checkpointsinstance ofsee Auditing and Failure Detection.The appendix contains discussion on typical extensions used in real-world systems0.80text
Reconfigurationinstance ofsee Auditing and Failure Detection.The appendix contains discussion on typical extensions used in real-world systems0.80text
and State Transfer.Ordering InputsThe critical step in building a distributed system of State Machines is choosing an order for the Inputs to be processedinstance ofsee Auditing and Failure Detection.The appendix contains discussion on typical extensions used in real-world systems0.80text
message lossinstance ofRealistic deployments must compensate for transient non-failure behaviors of the system0.80text
network partitionsinstance ofRealistic deployments must compensate for transient non-failure behaviors of the system0.80text
and slow processors.One technique is to store the series of Inputs in a loginstance ofRealistic deployments must compensate for transient non-failure behaviors of the system0.80text
Checkpointsinstance ofor support additional system features0.80text
and Reconfiguration.CheckpointsIf left unchecked a log will grow until it exhausts all available storage resourcesinstance ofor support additional system features0.80text
and Reconfigurationinstance ofor support additional system features0.80text

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