Active-Active vs Active-Passive Failover

http://www.jscape.com/blog/active-active-vs-active-passive-high-availability-cluster

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USA Zip Code – Offline Search

Technique 1: Use bucketing
https://www.unitedstateszipcodes.org/
http://www.zipmap.net/Texas/Harris_County.htm

Technique 2: If large area use offline maps
https://galileo-app.com/manual.html

https://mapzen.com/data/metro-extracts/
https://mapzen.com/documentation/metro-extracts/tutorial/

https://www.openstreetmap.org/#map=8/29.581/-93.642

The challenges we have is address normalization.