FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -These file segments are called as blocks. In other words, the minimum amount of data that HDFS can read or write is called a Block. The default block size is 128MB, but it can be increased as per the need to change in HDFS configuration.

Detailed explanation-2: -What are Blocks? The smallest quantity of data it can read or write is called a block. The default size of HDFS blocks is 128 MB, although this can be changed. HDFS files are divided into block-sized portions and stored as separate units.

Detailed explanation-3: -Blocks: A Block is the minimum amount of data that it can read or write. HDFS blocks are 128 MB by default and this is configurable. Files n HDFS are broken into block-sized chunks, which are stored as independent units.

Detailed explanation-4: -A typical block size used by HDFS is 128 MB. Thus, an HDFS file is chopped up into 128 MB chunks, and if possible, each chunk will reside on a different DataNode.

Detailed explanation-5: -HDFS is designed to reliably store very large files across machines in a large cluster. It stores each file as a sequence of blocks; all blocks in a file except the last block are the same size. The blocks of a file are replicated for fault tolerance. The block size and replication factor are configurable per file.