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when do reducers play their role in a mapreduce task?


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More MapReduce Interview Questions

How do Hadoop MapReduce works?

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How to optimize MapReduce Job?

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Clarify what combiners are and when you should utilize a combiner in a map reduce job?

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Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

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What is heartbeat in hdfs? Explain.

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What is the need of key-value pair to process the data in MapReduce?

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How do ‘map’ and ‘reduce’ work?

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Write a Mapreduce Program for Character Count ?

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What is OutputCommitter?

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How can we assure that the values regarding a particular key goes to the same reducer?

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What is the function of mapreduce partitioner?

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How to get the single file as the output from MapReduce Job?

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