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  1. Categories >> Software >> Big Data >> Hadoop >> Apache HDFS Hadoop Distributed File System
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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?

Question Posted / Awanish Kumar Jaiswal

Answer Posted / Awanish Kumar Jaiswal

A block in HDFS is the smallest unit of data that can be written to or read from the file system. The default block size in Hadoop 1 is 64MB, while in Hadoop 2 it's 128MB. Yes, you can change the block size according to your requirements.

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