limited commented on issue #1908: Changes for Backup Edge Cache Group
URL: 
https://github.com/apache/incubator-trafficcontrol/pull/1908#issuecomment-367795289
 
 
   @rawlinp  This backupList would be used to gain more control over which CGs 
can be a backup for a group. If a CG is not in the backup list, it won't be 
used, even if that means the request will be rejected. 
   
   We specifically implemented this code to not fall back to 
getClosestAvailableCachegroup(). This allows operators to compartmentalize 
traffic within portions of their network. (For example, if all the east coast 
caches go down, bandwidth-limited backbone/cross-country links will not be 
overwhelmed by all the requests going from east clients to west-coast caches). 
(This was actually the driving reason for this feature and why the existing 
getClosest... isn't sufficient in some cases).

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