what is JobTracker in Hadoop? What are the actions followed by Hadoop?
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What are ‘maps’ and ‘reduces’?
How to specify more than one directory as input to the MapReduce Job?
When Namenode is down what happens to job tracker?
Explain what is shuffling in mapreduce?
What is Data Locality in Hadoop?
how Hadoop is different from other data processing tools?
How to overwrite an existing output file during execution of mapreduce jobs?
What is the need of MapReduce?
What is identity mapper and identity reducer?
What is Text Input Format?
What is the difference between HDFS block and input split?
What can be optimum value for Reducer?
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