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The underlying client-server protocol has changed in version _______ of ZooKeeper.

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The underlying client-server protocol has changed in version _______ of ZooKeeper.

(a) 2.0.0

(b) 3.0.0

(c) 4.0.0

(d) 6.0.0

This question was addressed to me in examination.

I'm obligated to ask this question of Introduction to Zookeeper in section ZooKeeper, Sqoop and Cassandra of Hadoop

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The correct choice is (b) 3.0.0

Explanation: Old pre-3.0.0 clients are not guaranteed to operate against upgraded 3.0.0 servers and vice-versa.

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