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Can you explain combiner?


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More Hadoop General Interview Questions

Mention what are the most common input formats defined in hadoop?

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What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

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Explain how can you debug hadoop code?

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Clarify what a task tracker is in hadoop?

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What is single node cluster in Hadoop? for what all purposes Hadoop run on a single node cluster?

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How to do ‘map’ and ‘reduce’ works?

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What is the basic difference between traditional RDBMS and Hadoop?

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What is the relationship between Jobs and Tasks in Hadoop?

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Can you explain commodity hardware?

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Compare Hadoop 2 and Hadoop 3?

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What happens if you don?t override the mapper methods and keep them as it is?

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How often DataNode send heartbeat to NameNode in Hadoop?

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