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.
Cluster headache is a type of severe, recurring pain that is located on one side of the head. It received its name from the clustering, or pattern, of frequent headaches that usually occur. There are two main types of cluster headaches: Episodic cluster headachesâThese occur one or more times daily for 4-8 weeks.