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Which of the following commands does Hadoop offer to discover missing or corrupt HDFS data?

Which of the following commands does Hadoop offer to discover missing or corrupt HDFS data?

PrepAway - Latest Free Exam Questions & Answers

A.
Hadoop does not provide any tools to discover missing or corrupt data; there is no need
because three replicas are kept for each data block.

B.
dskchk

C.
du

D.
fsck

E.
The map-only checksum utility.

Explanation:
http://docs.hortonworks.com/CURRENT/index.htm#Monitoring_HDP/Using_Nagios_With_Hadoop/
Nagios_Alerts_For_Hadoop_Services.htm (Corrupt/missing block alert, Possible remedies, third
bulleted point)

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