In mapreduce what is a scarce system resource? Explain?
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What is the difference between HDFS block and input split?
Explain what you understand by speculative execution
How do Hadoop MapReduce works?
what are the three modes in which Hadoop can be run?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
What is the function of mapreduce partitioner?
What is the difference between Reducer and Combiner in Hadoop MapReduce?
What is streaming?
What is KeyValueTextInputFormat in Hadoop MapReduce?
What is identity mapper and reducer? In which cases can we use them?
how indexing in HDFS is done?
In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?
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