What combiners are and when you should use a combiner in a mapreduce job?
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What happens when a datanode fails ?
Explain what are the basic parameters of a mapper?
Explain about the partitioning, shuffle and sort phase
How to compress mapper output in Hadoop?
What is mapper in map reduce?
what are the most common input formats defined in Hadoop?
How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?
What are the various input and output types supported by mapreduce?
What is a RecordReader in Hadoop MapReduce?
What are advantages of Spark over MapReduce?
What are the configuration parameters in the 'MapReduce' program?
What is the sequence of execution of Mapper, Combiner, and Partitioner in MapReduce?
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