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When a verticle is deployed in High availability mode, it can fail over to any other nodes in the cluster started with the same HA group
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Management
Set
The HA mode can be defined in a run or start command
Group
A HA group defines a set of cluster.
It can be defined in a run or start command
There can be multiple HA groups in a cluster. Nodes will only failover to other nodes in the same group.
Defaults to 'DEFAULT'.