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

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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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Where sorting is done in Hadoop MapReduce Job?

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What is the job of blend () and repartition () in Map Reduce?

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

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What is the function of mapreducer partitioner?

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What is shuffling and sorting in Hadoop MapReduce?

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What happens when the node running the map task fails before the map output has been sent to the reducer?

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What is the core of the job in MapReduce framework?

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What happens when a DataNode fails during the write process?

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What is Output Format in MapReduce?

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How does fault tolerance work in mapreduce?

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