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What is IdentityMapper?


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More Apache Hadoop Interview Questions

What platform and java version are required to run hadoop?

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How to enable/configure the compression of map output data in hadoop?

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How to enable recycle bin or trash in hadoop?

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What if rack 2 and datanode fails?

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What is the difference between SQL and NoSQL?

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Explain a simple Map/Reduce problem.

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Can you give us some more details about ssh communication between masters and the slaves?

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

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What is HDFS Block size? How is it different from traditional file system block size?

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How does NameNode tackle DataNode failures?

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What are the most commonly defined input formats in Hadoop?

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What is difference between split and block in hadoop?

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