What does the High Availability of a Name-Node means? How is it accomplished?

To make the HDFS high accessible means, it must be accessible constantly. So we can accomplish HDFS HA by making the name-node high accessible with the goal that it could serve HDFS related demands and queries whenever it is needed.

To settle this Single Point of Failure issue of Name-Node, HA highlight was introduced in Hadoop 2. X where we have two Name-Node in our HDFS cluster in a functioning/passive configuration. Consequently, if the active Name-Node fails down, the other inactive Name-Node can assume control over the obligation of the failed NameNode and keep the HDFS running.