HDFS and MapReduce - Cloudera Administration - page 27

• Easy interface : The HDFS command-line interface is very similar to any Linux/
Unix system. The commands are similar in most cases. So, if one is comfortable
with the performing basic file actions in Linux/Unix, using commands with
HDFS should be very easy.
The following two daemons are responsible for operations on HDFS:
• Namenode
• Datanode
In Chapter 1 , Getting Started with Apache Hadoop , we already covered the details on how
the namenode and datanodes daemons work together to store files in the cluster. These
daemons talk to each other via TCP/IP.