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How to restart NameNode or all the daemons in Hadoop?


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More Hadoop General Interview Questions

Give me an example of document database ?

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What do you understand by standalone (or local) mode?

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Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?

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Explain the key benefits of using storm for real time processing?

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What are the core methods of a Reducer?

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What is the problem with small files in Hadoop?

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What are some typical functions of Job Tracker?

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What are the most common OutputFormat in Hadoop?

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Ideally what should be the replication factor in hadoop?

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

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What is Mapper in Hadoop?

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How often do you need to reformat the namenode?

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