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Can you explain combiner?


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More Hadoop General Interview Questions

How does hadoop achieve fault tolerance?

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How Big is ‘Big Data’?

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What are 'slaves' and 'masters' in Hadoop?

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Name the files which are used by the startup and shutdown commands?

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What is TextInputFormat in Hadoop?

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What is difference between reducer and combiner?

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What is the job tracker role in hadoop?

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Is it possible to provide multiple input to Hadoop? If yes then how?

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If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

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How to restart NameNode or all the daemons in Hadoop?

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What are configuration files in Hadoop?

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How can one write custom record reader?

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