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What do you mean by data locality?


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More MapReduce Interview Questions

What are the advantages of using mapreduce with hadoop?

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Write a Mapreduce Program for Character Count ?

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What platform and Java version is required to run Hadoop?

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What are ‘maps’ and ‘reduces’?

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Explain the features of Apache Spark because of which it is superior to Apache MapReduce?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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Explain the sequence of execution of all the components of MapReduce like a map, reduce, recordReader, split, combiner, partitioner, sort, shuffle.

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Does Partitioner run in its own JVM or shares with another process?

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How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

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Whether the output of mapper or output of partitioner written on local disk?

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

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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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