Answer / Santosh Kumar Dixit

In HDFS, a block is the smallest unit of data storage. Each file is divided into blocks before being written to the file system. By default, each block is 128 MB in size. This block-level organization allows efficient distribution and retrieval of files across multiple datanodes.

How hdfs is different from traditional file systems?

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Data node block size in HDFS, why 64MB?

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How to copy a file into HDFS with a different block size to that of existing block size configuration?

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What is the throughput?

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Explain the key features of hdfs?

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What is NameNode and DataNode in HDFS?

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What is a job tracker?

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What is active and passive NameNode 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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If a particular file is 50 mb, will the hdfs block still consume 64 mb as the default size?

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Explain the process that overwrites the replication factors in HDFS?

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

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