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Explain the core methods of the reducer?


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More Hadoop General Interview Questions

What is pseudo-distributed mode?

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Can you explain the common input formats in hadoop?

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Define a record reader?

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Mention how hadoop is different from other data processing tools?

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is there a standard procedure to deploy hadoop?

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What daemons run on master nodes?

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What is the command to change the replication factor ?

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Give a brief overview of Hadoop history?

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Explain how can you check whether namenode is working beside using the jps command?

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Do we require two servers for the namenode and the datanodes?

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Mention what is the data storage component used by hadoop?

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What are some typical functions of job tracker in hadoop?

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