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When should you use a reducer?


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More MapReduce Interview Questions

What are the steps involved in MapReduce framework?

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What is the function of mapreducer partitioner?

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Which one will you decide for an undertaking – Hadoop MapReduce or Apache Spark?

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What is an input reader in reference to mapreduce?

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What is the difference between RDBMS with Hadoop MapReduce?

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How to optimize Hadoop MapReduce Job?

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Where is Mapper output stored?

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In MapReduce Data Flow, when Combiner is called?

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Explain the difference between a MapReduce InputSplit and HDFS block?

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What is InputFormat in Hadoop MapReduce?

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List out Hadoop's three configuration files?

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how can you check whether Namenode is working beside using the jps command?

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