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How to overwrite an existing output file during execution of mapreduce jobs?
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Why Hadoop MapReduce?
What is an input reader in reference to mapreduce?
What is Shuffling and Sorting in a MapReduce?
Where sorting is done on mapper node or reducer node 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.
Mention what are the main configuration parameters that user need to specify to run mapreduce job?
How is reporting controlled in hadoop?
what is storage and compute nodes?
What is a Speculative Execution in Hadoop MapReduce?
Define Writable data types in Hadoop MapReduce?
Explain what is distributed cache in mapreduce framework?
What is the difference between map and reduce?
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