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when do reducers play their role in a mapreduce task?


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More MapReduce Interview Questions

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

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How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

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What does a 'MapReduce Partitioner' do?

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What is a mapreduce algorithm?

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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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What is identity mapper and reducer? In which cases can we use them?

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Define Writable data types in MapReduce?

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Mention what is the next step after mapper or maptask?

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what is WebDAV in Hadoop?

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In Hadoop, which file controls reporting in Hadoop?

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What are mapreduce new and old apis while writing map reduce program?. Explain how it works

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what happens in textinformat ?

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