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What are the core methods of a Reducer?


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More Hadoop General Interview Questions

After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

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What are the port numbers of task tracker?

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List some use cases where classification machine learning algorithms can be used.

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Explain Data Locality in Hadoop?

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Can you explain hadoop streaming?

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What is the use of cloudera?

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What happens if you get a ‘connection refused java exception’ when you type hadoop fsck /?

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Mention what is rack awareness?

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What is the non dfs used?

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How can one check whether NameNode is working or not?

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What are input format, input split & record reader and what they do?

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What happen if number of reducer is set to 0 in Hadoop?

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