What do you mean by data locality?
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What are the advantages of using mapreduce with hadoop?
Write a Mapreduce Program for Character Count ?
What platform and Java version is required to run Hadoop?
What are ‘maps’ and ‘reduces’?
Explain the features of Apache Spark because of which it is superior to Apache MapReduce?
How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?
Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.
Does Partitioner run in its own JVM or shares with another process?
How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?
Whether the output of mapper or output of partitioner written on local disk?
What is the Hadoop MapReduce API contract for a key and value Class?
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.
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