Three Operation modes of hadoop Learning Notes 2---hadoop
1. Stand-alone mode
It is easy to install and runs the service on a single machine with almost no configuration, but only for debugging purposes. Without a distributed file system, read and write the file system of the local operating system directly.
2. Pseudo-distributed mode
Start namenode, datanode, jobtracker, tasktracker, secondary namenode and other processes on a single node at the same time to simulate each node running in a distributed way. The configuration is already very close to fully distributed.
3. Fully distributed mode
A normal Hadoop cluster consists of multiple nodes performing their respective functions.
