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What is Apache Hadoop? Why is Hadoop essential for every Big Data application?


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More Apache Hadoop Interview Questions

What are the functionalities of jobtracker?

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What do you know about sequencefileinputformat?

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What do you mean by taskinstance?

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What is a Task instance in Hadoop? Where does it run?1

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What alternate way does HDFS provides to recover data in case a Namenode

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What are the two main parts of the hadoop framework?

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Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?

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What is the difference between a Hadoop and Relational Database and Nosql?

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How does NameNode tackle DataNode failures?

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Define streaming access?

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Define a combiner?

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What is Hadoop streaming?

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