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What is KeyValueTextInputFormat in Hadoop MapReduce?
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Name job control options specified by mapreduce.
How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.
Explain what does the conf.setmapper class do?
what is JobTracker in Hadoop? What are the actions followed by Hadoop?
How many Mappers run for a MapReduce job in Hadoop?
What combiners are and when you should use a combiner in a mapreduce job?
What happens when a DataNode fails during the write process?
When the reducers are are started in a mapreduce job?
What is Reducer in MapReduce?
What does conf.setmapper class do?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
Explain what is distributed cache in mapreduce framework?
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