In Map Reduce why map write output to Local Disk instead of HDFS?
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Why MapReduce uses the key-value pair to process the data?
In Hadoop what is InputSplit?
Explain what you understand by speculative execution
Explain how mapreduce works.
What do you know about nlineinputformat?
Where is Mapper output stored?
how JobTracker schedules a task ?
What combiners are and when you should use a combiner in a mapreduce job?
How to configure the number of the Combiner in MapReduce?
What is the Hadoop MapReduce API contract for a key and value Class?
What is MapReduce?
Explain what are the basic parameters of a mapper?
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