how JobTracker schedules a task ?
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Explain what combiners are and when you should use a combiner in a mapreduce job?
Explain what is distributed cache in mapreduce framework?
What is shuffling in mapreduce?
Describe what happens to a mapreduce job from submission to output?
What is a MapReduce Combiner?
What is Reducer in MapReduce?
What are the data components used by Hadoop?
What is the problem with the small file in Hadoop?
Detail description of the Reducer phases?
Does Partitioner run in its own JVM or shares with another process?
Explain task granularity
What is SequenceFileInputFormat in Hadoop MapReduce?
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