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What is identity mapper and chain mapper?


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More MapReduce Interview Questions

Difference between mapreduce and spark

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What is the problem with the small file in Hadoop?

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Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

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When should you use sequencefileinputformat?

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How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

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What is the fundamental difference between a MapReduce InputSplit and HDFS block?

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Why is Apache Spark faster than Hadoop MapReduce?

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Is it possible to search for files using wildcards?

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what is the Hadoop MapReduce APIs contract for a key and value class?

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How is reporting controlled in hadoop?

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Explain the process of spilling in Hadoop MapReduce?

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Explain what is shuffling in mapreduce?

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