When is it suggested to use a combiner in a MapReduce job?


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More MapReduce Interview Questions

How does MapReduce framework view its input internally?

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

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Is it possible to search for files using wildcards?

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What is the Hadoop MapReduce API contract for a key and value Class?

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Why is Apache Spark faster than Hadoop MapReduce?

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When should you use a reducer?

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What is the problem with the small file in Hadoop?

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What is Data Locality in Hadoop?

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When should you use sequencefileinputformat?

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What is an identity mapper and identity reducer?

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List the network requirements for using Hadoop ?

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In which kind of scenarios MapReduce jobs will be more useful than PIG in Hadoop?

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