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Explain why do we need hadoop?


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More Apache Hadoop Interview Questions

What happens to a namenode, when job tracker is down?

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Explain what is sqoop in Hadoop ?

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What is the use of combiners in the hadoop framework?

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What do you mean by taskinstance?

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What is crontab? Explain with suitable example?

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What are the modules that constitute the Apache Hadoop 2.0 framework?

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What do the master class and the output class do?

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What is the communication channel between client and namenode/datanode?

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What is the default replication factor?

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Mention what is the use of Context Object?

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What are the two main components of ResourceManager?

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