ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications.
In order to store persistent cluster metadata, Kafka uses ZooKeeper. Suppose, we lost the Kafka data in |zk|, the mapping of replicas to Kafka Brokers and topic configurations would be lost as well, making our Kafka Cluster no longer functional and potentially resulting in total data loss.
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