Since the Strangeloop talks won’t be available for a few months, I recorded a new version of the talk as a Google Hangout.
Update 2019-07-23: @insumity explains that ZooKeeper sync+read is not, in fact, linearizable–there are conditions under which it might return stale reads.
Zookeeper, or ZK for short, is a distributed CP datastore based on a consensus protocol called ZAB. ZAB is similar to Paxos in that it offers linearizable writes and is available whenever a majority quorum can complete a round, but unlike the Paxos papers, places a stronger emphasis on the role of a single leader in ensuring the consistency of commits.
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