Answer / Rishita Pramanik

Shuffling is the process in Hadoop MapReduce where intermediate key-value pairs generated by the map task are sorted and partitioned based on their keys, which enables efficient merging of these pairs during the reduce phase.

Can the balancer be run while Hadoop is in use?

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Explain how is hadoop different from other data processing tools?

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How many Daemon processes run on a Hadoop system?

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What are the benefits of block transfer?

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What is Safemode in Apache Hadoop?

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Explain the overview of hadoop history breifly?

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How blocks are distributed among all data nodes for a particular chunk of data?

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What stored in HDFS?

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What is a task instance in hadoop? Where does it run?

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What does job conf class do?

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Explain the difference between gen1 and gen2 hadoop with regards to the namenode?

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What are different types of filesystem?

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