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.
Nodes. A server cluster node is a system that has a working installation of Windows Server 2003, Enterprise Edition or Windows Server 2003, Datacenter Edition and the Cluster service.By definition, a node is always a member of a server cluster. For more information on the Cluster service, see Cluster service.Nodes have the following characteristics: 1  Every node is attached to one or more cluster storage devices. 2  Each cluster storage device attaches one or more disks. Every node is attached to one or more cluster storage devices. 2  Each cluster storage device attaches one or more disks. 3  The disks store all of the cluster's configuration and resource data. 4  Each disk can be owned by only one node at any point in time, but ownership can be transferred between nodes.