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A. JobTracker failure

B. TaskTracker failure

C. DataNode failure

D. NameNode failure

E. Secondary NameNode failure

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Correct Answer: Data Node Failure

HDFS unavailability is independent of the Jobtracker. If at least the NameNode is up, HDFS is nominally usable. With overall degradation, HDFS will be dependent on the total number of Datanodes down.

If you are interested in learning Hadoop, you can check out this Hadoop Training program by Intellipaat.

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