> > I agree that we need coordinator nodes, but I do not understand why can't > we reuse some cache nodes for it? Why do we need to ask user to start up > yet another type of node? >
Dmitriy, My understanding is that Semyon does not deny a cache node to be used as a coordinator. This property will allow to optionally have a *dedicated* node serving as a coordinator to improve cluster throughput under heavy load.
