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What is a udf?


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More Hadoop General Interview Questions

How to do ‘map’ and ‘reduce’ works?

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Is there another way to check whether Namenode is working?

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What happens if the number of reducers is 0 in Hadoop?

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How namenode handles data node failures?

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Clarify how job tracker schedules an assignment?

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What is a udf?

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Can I set the number of reducers to zero?

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What are the most common OutputFormat in Hadoop?

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Name the most common input formats defined in hadoop?

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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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Explain Data Locality in Hadoop?

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Do we need to place 2nd and 3rd data in rack 2 only?

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