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What is Mapper? How can we compress Mapper output in Hadoop?


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More Hadoop General Interview Questions

How to restart NameNode or all the daemons in Hadoop?

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What do you know about yarn?

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What does jps command do in Hadoop?

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Why cloudera is used?

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Mention what is data cleansing?

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Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

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What are the functionalities of jobtracer?

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What are the tools used in big data?

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Explain about Hadoop file system and processing framework?

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What type of data we should put in distributed cache? When to put the data in dc? How much volume we should put in?

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What is Erasure Coding in Hadoop?

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What do you understand by a closure in scala?

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