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Explain about the basic parameters of mapper and reducer function


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More MapReduce Interview Questions

What is the difference between Reducer and Combiner in Hadoop MapReduce?

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In Hadoop, which file controls reporting 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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What is an identity mapper and identity reducer?

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What is the input type/format in MapReduce by default?

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What MapReduce framework consists of?

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Can we set the number of reducers to zero in MapReduce?

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What is a Speculative Execution in Hadoop MapReduce?

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What is a map side join?

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Explain slot in Hadoop Map-Reduce v1?

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Explain what does the conf.setmapper class do?

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Clarify what is shuffling in map reduce?

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