Answer / Arjun Chaurasia

Hadoop performs several actions, including data storage (using HDFS), data processing (using MapReduce or Spark), and job scheduling and resource management (using YARN).

What is a commodity hardware? Does commodity hardware include RAM?

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What are the most common InputFormats in Hadoop?

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What jobtracker is in hadoop? What are the activities followed by hadoop?

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Clarify what jobtracker is in hadoop? What are the activities followed by hadoop?

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What is the non dfs used?

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Can you explain bloommapfile.

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What is NameNode? How NameNode tackle Datanode failures in Hadoop?

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Ideally what should be the block size in hadoop?

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Why we use intwritable instead of int? Why we use longwritable instead of long?

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How many job tracker processes can run on a single Hadoop cluster?

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What are the primary phases of the reducer?

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What are the different commands used to startup and shutdown Hadoop daemons?

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