Answer / Nishtha Behal

HDFS Federation is a scalability feature in Hadoop that allows multiple NameNodes to manage different portions of the HDFS namespace, thereby increasing the overall capacity and throughput of the system. Each NameNode is responsible for a specific portion of the data called a federated namespace. Clients interact with a single NameNode known as the root NameNode, which communicates with the other NameNodes to handle client requests.

Would you be able to change the block size of hdfs files?

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How data or file is read in HDFS?

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What is secondary namenode? Is it a substitute or back up node for the namenode?

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What is the difference between namenode, backup node and checkpoint namenode?

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How is NFS different from HDFS?

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Define hadoop archives? What is the command for archiving a group of files in hdfs.

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What are file permissions in HDFS? how does HDFS check permissions for files/directory?

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What are the main features of hdfssite.xml?

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Which classes are used by the hive to read and write hdfs files?

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What is active and passive NameNode in HDFS?

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Why is block size set to 128 MB in HDFS?

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Which one is the master node in HDFS? Can it be commodity hardware?

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