How does CDN calculate traffic hit rate?

CDN calculates the traffic hit rate by comparing the number of requests for content that are served directly from the CDN's cache to the total number of requests for that content.

Here's how it works:

1. Request: A user requests content from a website.
2. Cache Check: The CDN checks if the requested content is available in its edge servers' cache.
3. Hit or Miss:
   • If the content is found (a "hit"), it is served directly from the CDN, reducing latency and load on the origin server.
   • If the content is not found (a "miss"), the CDN retrieves it from the origin server and then caches it for future requests.

Calculation:

• Hit Rate = (Number of Cache Hits / Total Number of Requests) * 100

Example:

• Total Requests = 1000
• Cache Hits = 700
• Hit Rate = (700 / 1000) * 100 = 70%

A higher hit rate indicates that a larger percentage of requests are being served from the CDN's cache, which is more efficient and reduces the load on the origin server.

For optimizing CDN performance, services like Tencent Cloud's Content Delivery Network offer advanced caching mechanisms and real-time analytics to help monitor and improve hit rates.