Executive Summary
The purpose of this document is to explain how replication of data within CockroachDB can be used to tolerate various failure scenarios and the impacts to query execution times. This simulation will explore the effect of different replication factors on a database cluster that spans multiple Availability Zones in multiple Regions.
Overall, more replicas allows for more nodes to be down at the same time, while both R=5 and R=7 allow for the loss of an entire region. But, counterintuitively, R=7 only allows for a single Availability Zone to be lost, while R=5 allows for two.
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