Define Writable data types in MapReduce?
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When Namenode is down what happens to job tracker?
What is the need of MapReduce?
Explain task granularity
Clarify what combiners are and when you should utilize a combiner in a map reduce job?
Explain what is distributed cache in mapreduce framework?
What is the input type/format in MapReduce by default?
What is Counter in MapReduce?
Is reduce-only job possible in Hadoop MapReduce?
how to proceed to write your first mapreducer program?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
What is a MapReduce Combiner?
How data is spilt in Hadoop?
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