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More Apache Hadoop Interview Questions

What is the difference between rdbms and hadoop?

0 Answers  

What is the purpose of button groups?

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How do you define "block" in HDFS?

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Explain what is sqoop in Hadoop ?

0 Answers  

What alternate way does HDFS provides to recover data in case a Namenode

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Name some companies that use Hadoop?

0 Answers   Airtel,

How can I restart namenode?

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How can we check whether namenode is working or not?

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Why we cannot do aggregation (addition) in a mapper? Why we require reducer for that?

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On which port does ssh work?

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What will you do when NameNode is down?

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Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?

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