dneuman64 commented on issue #1908: Changes for Backup Edge Cache Group URL: https://github.com/apache/incubator-trafficcontrol/pull/1908#issuecomment-369252224 I think I agree with Rawlin. I understand the reason we have the backup list, and why using `getClosestAvailableCachegroup()` isn't used when the backup cache groups are exhausted, but I think we want the ability to be able to fallback to `getClosestAvailableCachegroup()` if need be. This would give us the ability to prefer the backup cache groups defined in the CZF but if all of those are unavailable we would still be able to serve content from the next closest cache group even though it might be a burden on the network. If you completely disagree then we can keep this PR as is and put in an issue to add the default functionality.
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