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Which are the methods in the mapper interface?
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How can you add the arbitrary key-value pairs in your mapper?
When is it not recommended to use MapReduce paradigm for large scale data processing?
What is a partitioner and how the user can control which key will go to which reducer?
Explain combiners.
Where is Mapper output stored?
What is mapreduce algorithm?
How data is spilt in Hadoop?
What is Counter in MapReduce?
What happens when a DataNode fails during the write process?
What is a mapreduce algorithm?
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.
Is it possible to rename the output file?
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