Formal Verification of Causal Order-Based Load Distribution Mechanism Using Event-B

Formal methods are mathematical techniques that use the concepts and ideas from mathematics and formal logic to specify and reason about system properties. It provides a framework which makes it possible to write specification, analyse and verify the model in a systematic way. Event-B is a formal method which is used to develop and verify the model of distributed systems. Event-B follows refinement-based approach to develop a complex model. In this paper, we have formally verified distributed load migration from heavily loaded site to low load site using Event-B. In order to provide fairness to load transfer mechanism, we have introduced a notion of causal order. The request for load transfer of that site will be completed first whose load request message causally precedes load request messages of other sites.

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