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  1. Categories >> Software >> Big Data >> Hadoop >> Apache Hadoop
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What will you do when NameNode is down?

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More Apache Hadoop Interview Questions

Explain how do ‘map’ and ‘reduce’ works?

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What is Apache Hadoop? Why is Hadoop essential for every Big Data application?

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What Mapper does?

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Name the examples of some companies that are using hadoop structure?

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Define streaming access?

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What are channel selectors?

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Why is Apache Spark faster than Apache Hadoop?

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How the Client communicates with HDFS?

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How did you debug your Hadoop code ?

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What is Derby database?

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what are Task Tracker and Job Tracker?

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What is Safemode in Apache Hadoop?

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