Answer / Kailash Chandra

Hadoop 3 introduces several improvements over Hadoop 2, including a new networking stack (Netty) for better performance and support for IPv6. It also offers simplified configuration management, eliminating many deprecated components from Hadoop 2. Another significant change is the restructuring of the NameNode into a separate Namenode-Journalnode architecture to improve fault tolerance. Other improvements include a new resource manager (RM) and a new application history service.

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

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Compare Apache Hadoop and Apache Spark?

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What is Reducer in Hadoop?

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If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?

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What is High Availability feature in Hadoop2?

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What is pseudo-distributed mode?

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Explain Hadoop streaming?

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If the hadoop administrator needs to make a change, which configuration file does he need to change?

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Why use hadoop?

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Explain how Hadoop cluster hardware planning and provisioning is done?

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Explain what is sequencefileinputformat?

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What are the core components of Hadoop?

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