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What is a IdentityMapper and IdentityReducer in MapReduce ?


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More MapReduce Interview Questions

Is YARN a replacement of Hadoop MapReduce?

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How to specify more than one directory as input in the Hadoop MapReduce Program?

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What are the the issues associated with the map and reduce slots based mechanism in mapReduce?

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How to change a number of mappers running on a slave in MapReduce?

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How to optimize Hadoop MapReduce Job?

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What is the difference between Hadoop and RDBMS?

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How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

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Where is Mapper output stored?

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Can you tell us how many daemon processes run on a hadoop system?

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What are advantages of Spark over MapReduce?

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Is it necessary to write a mapreduce job in java?

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How to optimize MapReduce Job?

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