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Explain combiners.
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More MapReduce Interview Questions
What is the InputSplit in map reduce ?
what job does the conf class do?
What is reduce side join in mapreduce?
Mention what is the hadoop mapreduce apis contract for a key and value class?
how Hadoop is different from other data processing tools?
What is the fundamental difference between a MapReduce Split and a HDFS block?scale data processing?
What is heartbeat in hdfs? Explain.
How many Mappers run for a MapReduce job?
What are ‘maps’ and ‘reduces’?
How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?
What is the difference between Hadoop and RDBMS?
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