Explain why do we need hadoop?
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What is partioner in hadoop? Where does it run,mapper or reducer?
What problems have you faced when you are working on Hadoop code?
what are Task Tracker and Job Tracker?
What is HDFS Federation?
What does /var/hadoop/pids do?
What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?
Explain what is sqoop in Hadoop ?
How can I restart namenode?
What is the best hardware configuration to run Hadoop?
What is a speculative execution in Apache Hadoop MapReduce?
Input Split & Record Reader and what they do?
Mention what is the use of Context Object?
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