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The Email & Apps team of ___________ uses ZooKeeper to coordinate sharding and responsibility changes in a distributed email client.

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The Email & Apps team of ___________ uses ZooKeeper to coordinate sharding and responsibility changes in a distributed email client.

(a) Katta

(b) Helprace

(c) Rackspace

(d) None of the mentioned

I got this question in an online quiz.

Enquiry is from The ZooKeeper Service topic in section ZooKeeper, Sqoop and Cassandra of Hadoop

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Correct option is (c) Rackspace

Easiest explanation: ZooKeeper also provides distributed locking for connections to prevent a cluster from overwhelming servers.

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