Define a metadata?
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What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
What do you know by storage and compute node?
What is the use of combiners in the hadoop framework?
Does Hadoop requires RAID?
Can you explain how do ‘map’ and ‘reduce’ work?
What is partioner in hadoop? Where does it run,mapper or reducer?
What is the difference between rdbms and hadoop?
shouldn't DFS be able to handle large volumes of data already?
How we can take Hadoop out of Safe Mode?
What is the best hardware configuration to run Hadoop?
What is yarn in hadoop?
Have you ever used Counters in Hadoop. Give us an example scenario?
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