Which of the following scenarios makes HDFS unavailable?
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
Right answer is D. Namenode failure. The link in explanation also says something.
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D. Namenode failue
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D
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I am surprised why it is not D
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I have the same idea. C
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It’s NOT C, the reference (stackoverflow) in the answer actually indicates:
HDFS is completely independent of the Jobtracker. As long as at least the NN is up, HDFS is nominally usable, with overall degradation dependent on the number of Datanodes that are down.
Assuming the stackoverflow is correct like the answer implicates, then the right answer should be D
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