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More Hadoop General Interview Questions

Explain what is sequencefileinputformat?

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Can you explain rack awareness?

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What is Rack Awareness? What is its need in Hadoop?

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Is it possible to provide multiple input to Hadoop? If yes then how?

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What is configured in /etc/hosts and what is its role in setting Hadoop cluster?

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Explain Data Locality in Hadoop?

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What happen if a datanode loses network connection for a few minutes?

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Clarify what a task tracker is in hadoop?

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Suppose hadoop spawned 100 tasks for a job and one of the tasks failed. What will hadoop do?

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How Hadoop’s CLASSPATH plays a vital role in starting or stopping in Hadoop daemons?

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What does rack awareness algorithm means and why is it utilized as a part of hadoop?

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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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