Answer / Sarvendra Kumar Rahul

HDFS Federation is the primary method used for helping the NameNode scale in Hadoop. By distributing the namespace and metadata across multiple NameNodes, it reduces the amount of data that needs to be managed by a single NameNode, thereby improving its performance and scalability.

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

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Can multiple clients write into a Hadoop HDFS file concurrently?

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Does the HDFS go wrong? If so, how?

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What are the main properties of hdfs-site.xml file?

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Suppose there is file of size 514 mb stored in hdfs (hadoop 2.x) using default block size configuration and default replication factor. Then, how many blocks will be created in total and what will be the size of each block?

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What is the difference between NAS and HDFS?

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Explain the process that overwrites the replication factors in HDFS?

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How to perform the inter-cluster data copying work in HDFS?

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Characterize data integrity? How does hdfs ensure information integrity of data blocks squares kept in hdfs?

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What should be the HDFS Block size to get maximum performance from Hadoop cluster?

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How does HDFS ensure Data Integrity of data blocks stored in HDFS?

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How is indexing done in Hadoop HDFS?

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