Answer / Virendra Kumar Singh

To change the name of the output file in a Hadoop MapReduce job, you can set the output path using FileOutputFormat.setOutputPath(JobContext context, Path output). You can then create a custom naming scheme for your output files.

What are ‘maps’ and ‘reduces’?

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What combiners are and when you should use a combiner in a mapreduce job?

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Is it legal to set the number of reducer task to zero? Where the output will be stored in this case?

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Can there be no Reducer?

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Explain the Reducer's Sort phase?

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When is it suggested to use a combiner in a MapReduce job?

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What is optimal size of a file for distributed cache?

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Explain slot in Hadoop Map-Reduce v1?

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Map reduce jobs are failing on a cluster that was just restarted. They worked before restart. What could be wrong?

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How to set the number of mappers to be created in MapReduce?

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what happens when Hadoop spawned 50 tasks for a job and one of the task failed?

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What do you mean by inputformat?

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