dneuman64 opened a new issue #4912:
URL: https://github.com/apache/trafficcontrol/issues/4912


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   ## I'm submitting a ...
   <!-- (check all that apply with "[x]") -->
   <!--- security vulnerability (STOP!! - see above)-->
   - [ ] bug report
   - [x] new feature / enhancement request
   - [ ] improvement request (usability, performance, tech debt, etc.)
   - [ ] other <!--(Please do not submit support requests here - see above)-->
   
   ## Traffic Control components affected ...
   <!-- (check all that apply with "[x]") -->
   - [ ] CDN in a Box
   - [ ] Documentation
   - [ ] Grove
   - [ ] Traffic Control Client
   - [ ] Traffic Monitor
   - [x] Traffic Ops
   - [ ] Traffic Ops ORT
   - [x] Traffic Portal
   - [x] Traffic Router
   - [ ] Traffic Stats
   - [ ] Traffic Vault
   - [ ] unknown
   
   ## Current behavior:
   <!-- Describe how the bug manifests / how the current features are 
insufficient. -->
   Currently if a client/resolver IP cannot be resolved via CZF and Maxmind 
does not know the location, Maxmind defaults to sending a lat/long that is 
exactly the center of the country.  Traffic Router then uses this to route to 
the closest cache group, which ends up being whichever is closest to the center 
of the country.  This can result in a non-trivial amount of traffic being 
incorrectly routed to one cache group causing potential capacity issues.
   
   ## Expected / new behavior:
   <!-- Describe what the behavior would be without the bug / how the feature 
would improve Traffic Control -->
   
   Traffic Control can be configured such that Traffic Router knows what the 
default location is for a country and will use the Geo Miss Default Latitude  
and Geo Miss Default Longitude for a DS when Maxmind returns the default 
lat/long for a country.  This will allow the traffic to be sent to a cache 
group that makes the best sent and can alleviate pressure on the most central 
cache group. 
   
   When this scenario is hit, TR should log a new rtype so that this traffic 
can be seen.  It should be something like GEO_DS
   
   
   ## Minimal reproduction of the problem with instructions:
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   If the current behavior is a bug or you can illustrate your feature request 
better with an example,
   please provide the *STEPS TO REPRODUCE* and include the applicable TC 
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   How to validate this is working as expected: 
   
   - DS1 is configured with a default lat/long
   - TR is configured to know to use the DS default lat/long for DS1
   - TR is configured to know the default lat/long for the US (37.751,-97.822)
   - If a request for DS1 comes into TR and has the default location, TR uses 
the default lat/long configured on the DS to choose a cache
   - TR logs the message with a new rtype to distinguish this from a regular 
GEO hit
   
   ## Anything else:
   <!-- e.g. stacktraces, related issues, suggestions how to fix -->
   
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