what is a sequence file in Hadoop?
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What do you mean by shuffling and sorting in MapReduce?
What is a "reducer" in Hadoop?
Explain the general mapreduce algorithm
How much space will the split occupy in Mapreduce?
What counter in Hadoop MapReduce?
Explain how mapreduce works.
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
What is the difference between an RDBMS and Hadoop?
How do you stop a running job gracefully?
how indexing in HDFS is done?
How to compress mapper output in Hadoop?
What happens when the node running the map task fails before the map output has been sent to the reducer?
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