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Helprace is using ZooKeeper on a _______ cluster in conjunction with Hadoop and HBase.

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Helprace is using ZooKeeper on a _______ cluster in conjunction with Hadoop and HBase.

(a) 3-node

(b) 4-node

(c) 5-node

(d) 6-node

I had been asked this question at a job interview.

My question is from The ZooKeeper Service in section ZooKeeper, Sqoop and Cassandra of Hadoop

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The correct choice is (a) 3-node

The explanation: Zookeeper is used to manage a system build out of hadoop, katta, oracle batch jobs and a web component.

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