Mention when to use Map reduce mode?
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Explain the differences between a combiner and reducer
What happens when a datanode fails ?
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
What is sqoop in Hadoop ?
What happens if the quantity of the reducer is 0 in mapreduce?
Why MapReduce uses the key-value pair to process the data?
How do Hadoop MapReduce works?
What are the identity mapper and reducer in MapReduce?
Define speculative execution?
What is the need of MapReduce in Hadoop?
Explain the Reducer's Sort phase?
Can we submit the mapreduce job from slave node?
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