Could anyone tell me what is a senior member in a coherence cluster?

Hi all,
I am problem finding the definition of Senior member in coherence documentation.
Could anyone tell me what is a Senior member in a coherence cluster?
Could we configure which server is Senior? How?
Thanks and Regards,
NB

Hi NB,
a senior member of a clustered service (there is one for each service) is the member which has special role in deciding service membership related issues. There is always one (usually the oldest living member), if it dies, then a new one is immediately elected.
Since the cluster is also a service it also has a senior member, and that is referred to as the senior member of the cluster.
You cannot configure which node is the senior for the cluster (or for any service for that matter), that is determined by the timing of the nodes being started, the senior will usually be the node started first unless they are started very quickly during cluster formation, at which point it can seem random from the outside.
Some parts of the documentation hints that the distributed cache services have a storage-senior node, too, which is not exactly the same thing as a service senior, as you can start a distributed cache service in a way that storage-disabled members happened to start first in which case the senior member for the service would not be storage-enabled and there would be no storage senior since there are no storage nodes until the first is started. You can consider this as a service (storage functionality) within a service (distributed cache service), similarly to how clustered services relate to the ClusterService.
Best regards,
Robert

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