The Overhead of Safe Broadcast Persistency

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Executive Summary

Although the need of logging messages in secondary storage once they have been received has been stated in several papers that assumed a recoverable failure model, none of them analyzed the overhead implied by that logging in case of using reliable broadcasts in a group communication system guaranteeing virtual synchrony. At a glance, it seems an excessive cost for its apparently limited advantages, but there are several scenarios that contradict this intuition. This paper surveys some of these configurations and outlines some benefits of this persistence-related approach.

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