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When a _______ is triggered the client receives a packet saying that the znode has changed.

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When a _______ is triggered the client receives a packet saying that the znode has changed.

(a) event

(b) watch

(c) row

(d) value

The question was posed to me during an interview.

My question is based upon Introduction to Zookeeper in portion ZooKeeper, Sqoop and Cassandra of Hadoop

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Correct option is (b) watch

The best I can explain: ZooKeeper supports the concept of watches. Clients can set a watch on a znodes.

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