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How to set the number of mappers for a MapReduce job?


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More MapReduce Interview Questions

When Namenode is down what happens to job tracker?

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Define the purpose of the partition function in mapreduce framework

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What are the primary phases of a Reducer?

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What is the difference between HDFS block and input split?

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What combiners is and when you should use a combiner in a MapReduce Job?

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What is the Reducer used for?

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When is it not recommended to use MapReduce paradigm for large scale data processing?

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Why Mapper runs in heavy weight process and not in a thread in MapReduce?

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What is shuffling and sorting in Hadoop MapReduce?

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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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Developing a MapReduce Application?

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What are ‘maps’ and ‘reduces’?

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