Can you explain how do ‘map’ and ‘reduce’ work?


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More Apache Hadoop Interview Questions

What is your favourite tool in the hadoop ecosystem?

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How many maximum jvm can run on a slave node?

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What exactly is hadoop?

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Explain the Job OutputFormat?

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What will you do when NameNode is down?

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How to enable recycle bin or trash in hadoop?

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What are the port numbers of namenode, job tracker and task tracker?

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What is the problem with small files in Apache Hadoop?

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Explain how input and output data format of the hadoop framework?

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Explain how is hadoop different from other data processing tools?

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What are the two main components of ResourceManager?

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What do you mean by taskinstance?

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