Introduction
The Hadoop file system is designed as a highly fault-tolerant file system that can be deployed on low-cost hardware. HDFS provides high throughput access to application data and is suitable for applications that have large datasets.
HDFS is designed for batch processing rather than interactive use by users. HDFS provides write-once-read-many access models. In this model, once a file is created, written and closed, it can not be changed except for appending and removing. HDFS does not support hard links or soft links.