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.
A description of the Beowulf cluster, from the original how-to, which was published by Jacek Radajewski and Douglas Eadline under the Linux Documentation Project in 1998.Beowulf is a multi-computer architecture which can be used for parallel computations.It is a system which usually consists of one server node, and one or more client nodes connected via Ethernet or some other network.o particular piece of software defines a cluster as a Beowulf. Beowulf clusters normally run a Unix-like operating system, such as BSD, Linux, or Solaris, normally built from free and open source software.