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What Are Good Use Cases For Impala As Opposed To Hive Or MapReduce?
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What is shuffling and sorting in Hadoop MapReduce?
Where is Mapper output stored?
What are the main components of MapReduce Job?
When should you use a reducer?
Explain what combiners are and when you should use a combiner in a mapreduce job?
What are the various InputFormats in Hadoop?
Explain what is shuffling in mapreduce?
What is the sequence of execution of map, reduce, recordreader, split, combiner, partitioner?
Can you tell us how many daemon processes run on a hadoop system?
What is Combiner in 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.
What is a combiner and where you should use it?
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