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Which of the following scenarios makes HDFS unavailable?

Which of the following scenarios makes HDFS unavailable?

PrepAway - Latest Free Exam Questions & Answers

A.
JobTracker failure

B.
TaskTracker failure

C.
DataNode failure

D.
NameNode failure

E.
Secondary NameNode failure

Explanation:
http://stackoverflow.com/questions/12362727/when-will-hdfs-be-unavailable

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