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What is Mapper in Hadoop?


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More Hadoop General Interview Questions

What are the features of Standalone (local) mode?

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Which object can be used to get the progress of a particular job

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What is NameNode? How NameNode tackle Datanode failures in Hadoop?

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Is Namenode machine same as DataNode machine as in terms of hardware in Hadoop?

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What is replication factor?

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What are the port numbers of task tracker?

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What do you know about yarn?

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What is active and passive NameNode in Hadoop?

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

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In which location name node sores its metadata and why?

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What is the procedure for namenode recovery?

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Which language is more suitable for text analytics? R or python?

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