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What is Reducer in Hadoop?


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More Hadoop General Interview Questions

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

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What is a record reader?

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Which port does SSH work on?

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Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?

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What a task tracker is in hadoop?

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Can we change the file cached by distributed cache

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What is the default replication factor in Hadoop and how will you change it?

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What is job tracker in Hadoop?

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For using hadoop list the network requirements?

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Can you define udf?

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Tell me some major benefits of Hadoop?

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What is active and passive NameNode in Hadoop?

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