Hi,
I was trying to setup a backup DC from existing DC.
State of existing DC with SimpleStrategy & rep_factor=1.
./nodetool -h localhost ring
Address DC Rack Status State Load Owns
Token
85070591730234615865843651857942052864
XXX.YYY DC1 RAC1 Up Normal 187.69 MB
50.00% 0
XXX.ZZZ DC1 RAC1 Up Normal 187.77 MB 50.00%
85070591730234615865843651857942052864
After adding backup DC with NetworkTopologyStrategy {DC1:1,DC2:1}, the
output is as follows
./nodetool -h localhost ring
Address DC Rack Status State Load Owns
Token
85070591730234615865843651857942052864
XXX.YYY DC1 RAC1 Up Normal 187.69 MB 50.00% 0
AAA.BBB DC2 RAC1 Up Normal 374.59 MB 11.99%
20392907958956928593056220689159358496
XXX.ZZZ DC1 RAC1 Up Normal 187.77 MB 38.01%
85070591730234615865843651857942052864
As per our app rules, all writes will first go through DC1 and then find
it's way to DC2. Since the "Owns" percentage has drastically changed, will
it mean that the DC1 nodes will become unbalanced for future writes?
We have a very balanced ring in our production with all nodes serving
almost equal volume data as of now in DC1. Will setting up a backup DC2
disturb the balance?
Thanks and Regards,
Ravi
