Node High availability requires minimum number of host to be commissioned in a cluster. Another significant pre requisite is with respect to ‘ZK’ service enabled on host. Node high availability activity involves some manual steps to be performed.
Users and privileges needs to considered on priority.
Node HA requires downtime. Many components and services require restart. Restart can be time consuming. Changes gets propagated to all the hosts.
Once we enable node high availability, it needs to be tested. Testing requires downtime and involved test cases. Test cases need to have all the cases where cluster services are tested. Test cases should be incremental. HA ensures smooth cluster functioning with one node failure.
Cluster HA is achieved by enabling multiple features. Node HA is just one of them.
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