Answer / Vaibhav Pratap Singh

An HDFS Block is the basic unit of storage, while an Input Split is a logical division of a data set that can be processed by a MapReduce task. Each Input Split may span multiple HDFS blocks.

What is the command for archiving a group of files in hdfs.

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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 happens when two users try to access to the same file in 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 do you mean by meta information 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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Why HDFS stores data using commodity hardware despite the higher chance of failures in hadoop?

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How data or file is read in HDFS?

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How to create Users in hadoop HDFS?

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What is a block in HDFS? what is the default size in Hadoop 1 and Hadoop 2? Can we change the block size?

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Define data integrity?

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File permissions in HDFS?

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