Organising LTL monitors over distributed systems with a global clock

Abstract

Users wanting to monitor distributed systems often prefer to abstract

away the architecture of the system, allowing them to directly specify correctness properties on the global system behaviour. To support this abstraction, a

compilation of the properties would not only involve the typical choice of monitoring algorithm, but also the organisation of submonitors across the component

network. Existing approaches, considered in the context of LTL properties over distributed systems with a global clock, include the so-called orchestration and migration approaches. In the orchestration approach, a central monitor receives the events from all subsystems. In the migration approach, LTL formulae transfer themselves across subsystems to gather local information.

We propose a third way of organising submonitors: choreography — where monitors are orgnized as a tree across the distributed system, and each child feeds

intermediate results to its parent. We formalise this approach, proving its correctness and worst case performance, and report on an empirical investigation

comparing the three approaches on several concerns of decentralised monitoring.