Answer / Pragya Aparajita

Task Tracker (TT) in Hadoop is a process responsible for executing MapReduce tasks on the worker nodes. It communicates with JobTracker (JT) to receive tasks, manage their execution, and report back the results. Each TT runs an associated NameNode to handle local HDFS operations.

What happen on the namenode when a client tries to read a data file?

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What is a record reader?

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What is JPS? Why is it used in Hadoop?

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Can you give a detailed overview about the Big Data being generated by Facebook?

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Which database is used in hadoop?

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What is the role of the secondary namenode?

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is there a standard procedure to deploy hadoop?

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What is the problem with small files in Hadoop?

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Why can we not create directory /user/dataflair/inpdata001 when name node is in safe mode?

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What happen if number of reducer is set to 0 in Hadoop?

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

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Can we deploye job tracker other than name node?

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