Ajil: Distributed Rate-Limiting for Multicast Networks

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Executive Summary

Multicast traffic patterns play a key role in dependable data centers, arising when data is replicated and distributed over multiple machines for fault-tolerance and availability. Such settings involve large numbers of multicast groups as well as multiple senders to each group - a single system can have hundreds of such multicast channels. Without effective multi-channel rate control, multicast senders cannot determine the right rate to send data at and often transmit to groups as fast as possible. As a result, multicast channels are subject to traffic spikes that can overload individual end-hosts within the data center as well as its communication back-plane. This paper introduces and evaluates Ajil, a distributed rate-limiting protocol for data centers.

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