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How to do ‘map’ and ‘reduce’ works?


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More Hadoop General Interview Questions

What are the side data distribution techniques?

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If the hadoop administrator needs to make a change, which configuration file does he need to change?

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What are the important modes of hadoop?

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

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If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

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

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What mode(s) can hadoop code be run in?

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

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Explain what is a task tracker in hadoop?

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When we send a data to a node, do we allow settling in time, before sending another data to that node?

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How does speculative execution work in Hadoop?

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Name the most common input formats defined in hadoop?

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