Why Mapreduce output written in local disk?
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What is Combiner in MapReduce?
What is the Hadoop MapReduce API contract for a key and value Class?
What is the problem with the small file in Hadoop?
What do you mean by data locality?
Where is the output of Mapper written in Hadoop?
When should you use sequencefileinputformat?
What do you understand by the term Straggler ?
Explain the difference between a MapReduce InputSplit and HDFS block?
What combiners are and when you should use a combiner in a mapreduce job?
What are the advantages of using mapreduce with hadoop?
How do you stop a running job gracefully?
What are ‘maps’ and ‘reduces’?
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