HDFS Architecture
An HDFS cluster consists of a single NameNode, a master server that manages the file system namespace and regulates access to files by clients. In addition, there are a number of DataNodes, usually one per node in the cluster, which manage storage attached to the nodes that they run on.
https://hadoop.apache.org/docs/r1.2.1/images/hdfsarchitecture.gif
An HDFS cluster consists of a single NameNode, a master server that manages the file system namespace and regulates access to files by clients. In addition, there are a number of DataNodes, usually one per node in the cluster, which manage storage attached to the nodes that they run on.
https://hadoop.apache.org/docs/r1.2.1/images/hdfsarchitecture.gif
