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Explain what does the conf.setmapper class do?


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More MapReduce Interview Questions

What happen if the number of the reducer is 0 in MapReduce?

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Explain what is distributed cache in mapreduce framework?

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Explain what is “map” and what is "reducer" in hadoop?

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What is a IdentityMapper and IdentityReducer in MapReduce ?

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Why MapReduce uses the key-value pair to process the data?

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when do reducers play their role in a mapreduce task?

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what does the conf.setMapper Class do ?

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

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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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What is Text Input Format?

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List out Hadoop's three configuration files?

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How to optimize MapReduce Job?

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