Is it mandatory to set input and output type/format in MapReduce?

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How can we assure that the values regarding a particular key goes to the same reducer?

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What is KeyValueTextInputFormat in Hadoop MapReduce?

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When is the reducers are started in a MapReduce job?

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What is the data storage component used by Hadoop?

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what does the conf.setMapper Class do ?

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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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How to set which framework would be used to run mapreduce program?

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How to optimize Hadoop MapReduce Job?

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How to submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

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It can be possible that a Job has 0 reducers?

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Explain what are the basic parameters of a mapper?

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