When should you use sequencefileinputformat?
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how is data partitioned before it is sent to the reducer if no custom partitioner is defined in Hadoop?
Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?
What is identity mapper and reducer? In which cases can we use them?
Clarify what is shuffling in map reduce?
Detail description of the Reducer phases?
What is the Reducer used for?
What is Combiner in MapReduce?
How to optimize Hadoop MapReduce Job?
Why the output of map tasks are stored (spilled ) into local disc and not in hdfs?
How much space will the split occupy in Mapreduce?
What is Reducer in MapReduce?
Explain combiners.
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