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


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More MapReduce Interview Questions

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

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What is shuffling and sorting in mapreduce?

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How to specify more than one directory as input to the MapReduce Job?

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What is the use of InputFormat in MapReduce process?

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Why Hadoop MapReduce?

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What is a Speculative Execution in Hadoop MapReduce?

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What is the difference between Job and Task in MapReduce?

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what is Speculative Execution?

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What platform and Java version is required to run Hadoop?

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what is JobTracker in Hadoop? What are the actions followed by Hadoop?

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How many times combiner is called on a mapper node in Hadoop?

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What are the four basic parameters of a reducer?

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