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What happens when a datanode fails ?


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More MapReduce Interview Questions

Is it possible to search for files using wildcards?

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How can we assure that the values regarding a particular key goes to the same reducer?

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What is the function of mapreduce partitioner?

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What is shuffling in mapreduce?

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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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What is SequenceFileInputFormat in Hadoop MapReduce?

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What do sorting and shuffling do?

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Which among the two is preferable for the project- Hadoop MapReduce or Apache Spark?

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Explain slot in Hadoop Map-Reduce v1?

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What is Distributed Cache in the MapReduce Framework?

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What is Mapper in Hadoop MapReduce?

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What are the various configuration parameters required to run a mapreduce job?

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