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what is "map" and what is "reducer" in Hadoop?
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How many Mappers run for a MapReduce job in Hadoop?
What is sqoop in Hadoop ?
What happens when the node running the map task fails before the map output has been sent to the reducer?
Why do we need MapReduce during Pig programming?
How to set which framework would be used to run mapreduce program?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
What is heartbeat in hdfs? Explain.
What is Hadoop Map Reduce ?
How is mapreduce related to cloud computing?
Describe what happens to a mapreduce job from submission to output?
What is the utility of using Writable Comparable Custom Class in Map Reduce code?
How to optimize Hadoop MapReduce Job?
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