What is HDFS Block size? How is it different from traditional file system block size?
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What does /var/hadoop/pids do?
What will you do when NameNode is down?
What is Hadoop serialization?
What is IdentityMapper?
What stored in HDFS?
how would you modify that solution to only count the number of unique words in all the documents?
Define tasktracker.
What is Hadoop streaming?
What is small file problem in hadoop?
How we can take Hadoop out of Safe Mode?
Explain a simple Map/Reduce problem.
explain Metadata in Namenode?
What is a “Distributed Cache” in Apache Hadoop?
Should we use RAID in Hadoop or not?
Explain why do we need hadoop?