public interface ClusterView
'Seeing each other'/A cluster refers to being hooked to the same underlying persistence layer/jcr repository.
A ClusterView can also consist of just one single instance.
All instances in a cluster must and do have a unique sling.id.
|Modifier and Type||Method and Description|
Returns a stable id of the cluster represented by this cluster view.
Provides the list of InstanceDescriptions with a stable ordering.
Provides the InstanceDescription belonging to the leader instance.
Similar to the SlingID, this id is persisted and thus remains stable accross instance/cluster restarts.
When an instance joins a cluster, it will inherit the id from the joined cluster (thus incurs a cluster id change).
Note: When instances part from a cluster (eg due to a network partitioning) the cluster id is retained. This results in potentially multiple clusters with the same id. This fact could be used to detect such partitioning/split brain situations. It also implies though that the cluster id is not guaranteed to be unique in a topology!
Addition in 1.0.4: this id must consist only of alphanumeric characters plus dash '-' and underscore '_'.
Stable ordering implies that unless an instance leaves the cluster (due to shutdown/crash/network problems) the instance keeps the relative position in the list.
Every ClusterView is guaranteed to have one and only one leader.
The leader is stable: once a leader is elected it stays leader unless it leaves the cluster (due to shutdown/crash/network problems)
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