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What happens when a datanode fails ?


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More MapReduce Interview Questions

What is OutputCommitter?

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What do you mean by shuffling and sorting in MapReduce?

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What is a TaskInstance?

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When should you use a reducer?

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

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Is YARN a replacement of Hadoop MapReduce?

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Clarify what is shuffling in map reduce?

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Which interface needs to be implemented to create Mapper and Reducer for the Hadoop?

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How to submit extra files(jars, static files) for Hadoop MapReduce job during runtime?

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Explain the process of spilling in Hadoop MapReduce?

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What happens when a datanode fails ?

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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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