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What is a block in HDFS, why block size 64MB?

Answer Posted / Rita Devi

A block in HDFS (Hadoop Distributed File System) is the smallest unit of data storage. Each file is divided into multiple blocks, which are then distributed across DataNodes for parallel processing and fault tolerance. The default block size in HDFS is 64MB, chosen to balance between providing enough space for large files and reducing network traffic when transferring small files.

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