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Text Elements
CDN Server
Key
Key
Value
Value
Cache
HTTP requests
Key
Key
Value
Value
Cache
CDN Server
Key
Key
Value
Value
Cache
CDN Server
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geographically distributed CDN nodes
Multi Instance server
Notes:
- How do we notify the edge nodes that we have updated content?
- Push vs. pull.
- What happens on a cache miss on the CDN?
- How to handle CDN node outages?
- DNS service should be aware of which nodes are alive…
orchestrator
DNS
heartbeat
on cache miss, CDN pulls latest from server
server can send request to CDN node to invalidate key; next request will pull from server