There is nothing sacred about electrons being called negative charge and protons positive charge.Itâs just a convention. You, can very well call electrons as positive charge and protons as negative charge!
Single Node or Psuedo-Distributed Cluster is the one in which all the essential daemons (like NameNode, DataNode, JobTracker and TaskTracker) run on the same machine. The default replication factor for a single node cluster is 1. A single node cluster is basically used to simulate a full cluster like environment and to test hadoop applications and unlike the Stand-alone mode, HDFS is accessible in this.
How a Server Cluster Works. How a Server Cluster Works. A server cluster is a collection of servers, called nodes that communicate with each other to make a set of services highly available to clients. Server clusters are based on one of the two clustering technologies in the Microsoft Windows Server 2003 operating systems.