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Define a datanode?


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More Apache Hadoop Interview Questions

What is configuration of a typical slave node on Hadoop cluster? How many JVMs run on a slave node?

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How did you debug your Hadoop code ?

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In which location Name Node stores its Metadata and why?

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What is InputSplit and RecordReader?

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Mention what is the use of Context Object?

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What is the default block size in hdfs?

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Explain the difference between NameNode

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What is a Secondary Namenode? Is it a substitute to the Namenode?

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Explain what if rack 2 and datanode fails?

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What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

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How is security achieved in Apache Hadoop?

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What does /etc /init.d do?

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