问题
I have 3 nodes where Kafka is installed. All these 3 nodes have their own zookeeper instances. Are 3 zookeeper instances required or is 1 zookeeper instance suffice? Should we have multiple zookeeper instances for fault tolerance & in such a scenario would one of the instances act as primary and would others be replica?
回答1:
I'm not sure what you mean by "All these 3 nodes have their own zookeeper instances" Basically you should have a single cluster of one, three or five Zookeeper instances and all Kafka brokers should use the same cluster. You don't need more than one Zookeeper instance but I'd highly recommend to use three or five instances because of availability. We use three instances of Zookeeper to run our Kafka cluster.
来源：https://stackoverflow.com/questions/35561964/zoopekeeper-instances-in-kafka