What are the various configuration parameters required to run a mapreduce job?

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In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

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What are ‘reduces’?

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What is Output Format in MapReduce?

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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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What is the difference between HDFS block and input split?

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Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

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What combiners are and when you should use a combiner in a mapreduce job?

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What is the default value of map and reduce max attempts?

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What do you know about nlineinputformat?

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If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?

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Define Writable data types in MapReduce?

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