Please improve the documentation on gmcast.segment. The current documentation ('It defines the segment to which the node belongs. ') is correct, but:
- Segments mean that galera protocol traffic is only redirected to 1 node in each segment, and then relayed to the other nodes in the same segment. This saves cross-datacenter network traffic at the expense of some extra latency.
- State transfers are also, preferably but not exclusively, taken from the same segment. If there are no nodes available in the same segment it will do SST from other node