Explain how mapreduce works.


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More MapReduce Interview Questions

Mention what is the hadoop mapreduce apis contract for a key and value class?

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What is heartbeat in hdfs?

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what is Speculative Execution?

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Explain the process of spilling in Hadoop MapReduce?

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Map reduce jobs take too long. What can be done to improve the performance of the cluster?

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List the network requirements for using Hadoop ?

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mapper or reducer?

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what is storage and compute nodes?

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In Hadoop what is InputSplit?

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What is the role of recordreader in hadoop mapreduce?

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Explain job scheduling through JobTracker

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

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