Hello,

I was wondering how to avoid split-brain issues when using a cluster 
singleton and automatic downing.
Wouldn't it make sense to add a "min-nr-of-members" setting to the 
singleton? That is, the singleton wouldn't start unless there's a given 
number of members in the cluster online. That would solve the split brain 
problem with singletons.

I know there is the per-role "min-nr-of-members" setting, which impacts the 
startup of the cluster as a whole, and maybe this could be re-used 
(currently if nodes start up, and then some die (leaving a smaller number 
than the setting alive), the singleton starts up anyway).

Adam

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