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What is Reducer in Hadoop?


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More Hadoop General Interview Questions

Can you give a detailed overview about the Big Data being generated by Facebook?

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what is next step after mapper or maptask?

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Did you ever ran into a lop sided job that resulted in out of memory error, if yes then how did you handled it ?

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What is winutils hadoop?

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What is the key difference between NameNode and DataNode in Hadoop?

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Can you explain combiner?

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Explain Hadoop Archives?

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How to add/delete a Node to the existing cluster?

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How many daemon processes run on a hadoop cluster?

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When we send a data to a node, do we allow settling in time, before sending another data to that node?

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What is Disk Balancer in Hadoop?

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How analysis of Big Data is useful for organizations?

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