HDFS explained
Parts, in publishing order
- Hadoop distributed file system, part 1: why HDFS and how blocks work
Why Hadoop needs its own file system, how HDFS compares with local file systems, and how block storage and replication work.
- Hadoop distributed file system, part 2: working with HDFS, reads and writes
The HDFS shell commands, then how the name node and data nodes handle a read, a write and replica placement.