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Mandrake: multiagent systems as a basis for programming fault-tolerant decentralized applications.

Samuel H Christie^1,2, Amit K Chopra¹, Munindar P Singh²

¹Lancaster University, Lancaster, UK.

Autonomous Agents and Multi-Agent Systems

|February 28, 2022

Summary

Mandrake is a new programming model for decentralized applications. It enables autonomous agents to communicate reliably over unreliable networks without infrastructure guarantees, simplifying fault-tolerant development.

Keywords:

Agent programming Fault tolerance Protocols

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Area of Science:

Computer Science
Distributed Systems
Software Engineering

Background:

Decentralized software applications, composed of autonomous agents using asynchronous messaging, are gaining traction in microservices and the Internet of Things.
Developing decentralized applications requires agents to coordinate effectively despite potential faults like message loss, delay, and reordering.
Existing paradigms often rely on infrastructure guarantees for reliable communication, which is not always feasible.

Purpose of the Study:

To introduce Mandrake, a novel programming model for constructing decentralized applications.
To address challenges in agent communication and fault tolerance without depending on infrastructure guarantees.
To facilitate the creation of robust decentralized systems through a new approach to information protocols.

Main Methods:

Conceptualized decentralized applications as collections of autonomous agents communicating via asynchronous messaging.
Introduced the concept of an "information protocol" specifying messaging in causal terms for shared-nothing environments.
Developed Mandrake, a programming model with a declarative policy language for implementing fault-tolerant agents.

Main Results:

Mandrake enables the implementation of protocol-compliant agents using a new programming model.
Protocols can be transformed into fault-tolerant versions through simple annotations.
Fault tolerance is easily implemented in agents by leveraging protocol capabilities via a declarative policy language.

Conclusions:

Mandrake provides a straightforward method for building decentralized applications.
The model achieves decentralization without relying on infrastructure-based coordination mechanisms.
This approach aligns with foundational goals of networked computing from the 1970s.