Eureka! Why You Shouldn't Use ZooKeeper for Service Discovery - N choose K / Knew Tech Blog
In CAP terms, ZooKeeper is CP, meaning that it's consistent in the face of partitions, not available. For many things that ZooKeeper does, this is a necessary trade-off. Since ZooKeeper is first and foremost a coordination service, having an eventually consistent design (being AP) would be a horrible design decision. Its core consensus algorithm, Zab, is therefore all about consistency.
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