I am OK with CLUSTER_REGION_ID. However I would like this name - DISCOVERY_REGION_ID - more.
>> Do you think we will ever care about the order of nodes within the same region, e.g. does the order of nodes within the same rack matter? >> I think this is too much, but if you care you still can. Imagine you have 1000..1010 values for machines in rack 1 and 2000..2010 values for machines in rack 2. So you can set exact position for each machine. This approach provides full flexibility. I will update https://issues.apache.org/jira/browse/IGNITE-4501 shortly. --Yakov
