As we just said, HA duplicates all incoming resource data so that two copies exist instead of one in both the GemFire cache and Persistence layers. This is done by creating a secondary copy of each piece of data that is used in queries, if the node hosting a primary copy is unavailable.
It is important to note that as HA is simply creating a secondary copy of each piece of data, as such only one node failure can be sustained at a time (N-1) without data loss, regardless of the cluster size. If a node is down, a new secondary shard of the data is not created unless the original node is removed from the cluster permanently.
When a failed node becomes available again, a node is placed into recovery mode. ...
