Visible to the public White-Box Atomic Multicast

TitleWhite-Box Atomic Multicast
Publication TypeConference Paper
Year of Publication2019
AuthorsGotsman, Alexey, Lefort, Anatole, Chockler, Gregory
Conference Name2019 49th Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN)
Date Publishedjun
KeywordsAtomic multicast, atomic multicast needs, classical Skeen's multicast protocol, Clocks, composability, Concurrency, delays, destination groups, destination processes, Fault tolerance, Fault tolerant systems, genuine atomic multicast protocol, message delays, Metrics, multicast protocols, optimisation, pubcrawl, replication, resilience, Resiliency, white box cryptography, white-box atomic multicast, white-box optimisations

Atomic multicast is a communication primitive that delivers messages to multiple groups of processes according to some total order, with each group receiving the projection of the total order onto messages addressed to it. To be scalable, atomic multicast needs to be genuine, meaning that only the destination processes of a message should participate in ordering it. In this paper we propose a novel genuine atomic multicast protocol that in the absence of failures takes as low as 3 message delays to deliver a message when no other messages are multicast concurrently to its destination groups, and 5 message delays in the presence of concurrency. This improves the latencies of both the fault-tolerant version of classical Skeen's multicast protocol (6 or 12 message delays, depending on concurrency) and its recent improvement by Coelho et al. (4 or 8 message delays). To achieve such low latencies, we depart from the typical way of guaranteeing fault-tolerance by replicating each group with Paxos. Instead, we weave Paxos and Skeen's protocol together into a single coherent protocol, exploiting opportunities for white-box optimisations. We experimentally demonstrate that the superior theoretical characteristics of our protocol are reflected in practical performance pay-offs.

Citation Keygotsman_white-box_2019