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Explain why do we need hadoop?


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More Apache Hadoop Interview Questions

What is partioner in hadoop? Where does it run,mapper or reducer?

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What problems have you faced when you are working on Hadoop code?

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what are Task Tracker and Job Tracker?

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What is HDFS Federation?

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What does /var/hadoop/pids do?

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What is the default block size in Hadoop 1 and in Hadoop 2? Can it be changed?

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Explain what is sqoop in Hadoop ?

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How can I restart namenode?

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What is the best hardware configuration to run Hadoop?

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What is a speculative execution in Apache Hadoop MapReduce?

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Input Split & Record Reader and what they do?

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Mention what is the use of Context Object?

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