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What is a block and block scanner in HDFS?


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More Apache Hadoop Interview Questions

What is Partioner in hadoop? Where does it run

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How can one increase replication factor to a desired value in Hadoop?

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

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What is a speculative execution in Apache Hadoop MapReduce?

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What are sink processors?

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

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What is the sequencefileinputformat in hadoop?

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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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Explain the basic difference between traditional rdbms and hadoop?

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