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What is difference between reducer and combiner?


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More Hadoop General Interview Questions

What is the characteristic of streaming API that makes it flexible run MapReduce jobs in languages like Perl, Ruby, Awk etc.?

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

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When we send a data to a node, do we allow settling in time, before sending another data to that node?

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Why do we need Hadoop Archives? How is it created?

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What is difference between reducer and combiner?

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Explain what is speculative execution?

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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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Can I set the number of reducers to zero?

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Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?

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What does secondary name-node means?

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Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

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Explain the difference between an inputsplit and a block?

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