What combiners are and when you should utilize a combiner in a map reduce job?
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Mention Hadoop core components?
Mention what is the hadoop mapreduce apis contract for a key and value class?
How many Mappers run for a MapReduce job in Hadoop?
Explain task granularity
How to optimize MapReduce Job?
Define the purpose of the partition function in mapreduce framework
Mention when to use Map reduce mode?
What are the data components used by Hadoop?
What does conf.setmapper class do?
Why Mapreduce output written in local disk?
What is Text Input Format?
Explain JobConf in MapReduce.
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