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How to restore namenode HA pair when active namenode is unavilable on amazon ec2 instance

Contributor

A client is running HDP cluster with a High Availability HDFS Namenode configuration, deployed on AWS EC2 instances. I receive an alert that the primary Namenode instance has become unavailable and upon inspection I determine that the Namenode instance is unreachable and will need to be replaced.

Questions:

1.What steps need to be taken to restore the Namenode HA pair?

2. Ephemeral namenode, journalnode and zookeeper directories are present on the same node. how to deploy the role and restore service

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