Friday, October 11, 2013

Rapid read protection in Cassandra 2.0.2

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Rapid read protection allows Cassandra to tolerate node failure without dropping a single request. We designed it for 2.0, but it took some extra time to get the corner cases worked out. It’s finished now for the upcoming Cassandra 2.0.2 release.

It’s easier to explain how it works after showing what it does. Here’s a graph of a small four-node Cassandra cluster with three replicas being stress-tested with five different rapid read protection settings, and one with none at all:

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