What is identity mapper and chain mapper?


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More MapReduce Interview Questions

It can be possible that a Job has 0 reducers?

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Define speculative execution?

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how indexing in HDFS is done?

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what is WebDAV in Hadoop?

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Explain combiners.

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Mention when to use Map reduce mode?

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What are the various configuration parameters required to run a mapreduce job?

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What is heartbeat in hdfs?

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In Hadoop what is InputSplit?

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How data is spilt in Hadoop?

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Explain how do ‘map’ and ‘reduce’ work?

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How to create custom key and custom value in MapReduce Job?

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