In Hadoop 2.0, which TWO of the following processes work together to provide automatic failover of the NameNode? Choose 2 answers

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In Hadoop 2.0, which TWO of the following processes work together to provide automatic failover of the NameNode? Choose 2 answers
A . ZKFailoverController
B . ZooKeeper
C . QuorumManager
D . JournalNode

Answer: A,D

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