July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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Hadoop Distributed File System (HDFS)
HDFS is a software-based filesystem implemented in Java and sits on top of the native file system. The main concept behind HDFS is that it divides a file into blocks (typically 128 MB) instead of dealing with a file as a whole. This allowed many features such as distribution, replication, failure recovery, and more importantly distributed processing of the blocks using multiple machines.
Block sizes can be 64 MB, 128 MB, 256 MB, or 512 MB, whatever suits the purpose. For a 1 GB file with 128 MB blocks, there will be 1024 MB / 128 MB = 8 blocks. If you consider replication factor of 3, this makes it 24 blocks.
HDFS provides a distributed storage system with fault tolerance and failure recovery. HDFS has ...
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