Explain combiners.
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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?
What is the need of key-value pair to process the data in MapReduce?
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