what is JobTracker in Hadoop? What are the actions followed by Hadoop?
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Explain about the partitioning, shuffle and sort phase
What is the input type/format in MapReduce by default?
Is reduce-only job possible in Hadoop MapReduce?
What is shuffleing in mapreduce?
Explain job scheduling through JobTracker
Explain what is “map” and what is "reducer" in hadoop?
How many times combiner is called on a mapper node in Hadoop?
What is difference between a MapReduce InputSplit and HDFS block
What is the relation between MapReduce and Hive?
What happens when a datanode fails ?
How to change a number of mappers running on a slave in MapReduce?
What is reduce side join in mapreduce?
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