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what is "map" and what is "reducer" in Hadoop?


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More MapReduce Interview Questions

Is Mapreduce Required For Impala? Will Impala Continue To Work As Expected If Mapreduce Is Stopped?

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Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

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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 the key- value pair in MapReduce?

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Write a short note on the disadvantages of mapreduce

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How does Mappers run method works?

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How do Hadoop MapReduce works?

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What is the relation between MapReduce and Hive?

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How many Mappers run for a MapReduce job in Hadoop?

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How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

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Is it possible to rename the output file?

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

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