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How many instances of a jobtracker run on hadoop cluster?


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More Apache Hadoop Interview Questions

Mention what is the number of default partitioner in Hadoop?

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What is the use of Combiner?

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Did you ever built a production process in hadoop ? If yes then what was the process when your hadoop job fails due to any reason?

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What is the port number for NameNode

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What is column families? What happens if you alter the block size of ColumnFamily on an already populated database?

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Is hadoop based on google mapreduce?

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

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Can hive run without hadoop?

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What are the limitations of importing RDBMS tables into Hcatalog directly?

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Explain the wordcount implementation via hadoop framework ?

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Define fault tolerance?

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Why do we use Hadoop?

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