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What is mapper in map reduce?


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More MapReduce Interview Questions

what is JobTracker in Hadoop? What are the actions followed by Hadoop?

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Explain what does the conf.setmapper class do?

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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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Explain JobConf in MapReduce.

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How does MapReduce framework view its input internally?

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Write a Mapreduce Program for Character Count ?

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What is the utility of using Writable Comparable Custom Class in Map Reduce code?

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How to get the single file as the output from MapReduce Job?

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How do Hadoop MapReduce works?

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

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In Map Reduce why map write output to Local Disk instead of HDFS?

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How to write a custom partitioner for a Hadoop MapReduce job?

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