Question

What are the causes of a decreased cache hit rate on a CDN node?

Answer

The cache hit rate on a CDN node may decrease in the following scenarios:
  • When you refresh the resources cached on a CDN node, the hit rate may be decreased in a short period of time.
  • When the bandwidth spikes, the corresponding CDN node has to redirect more back-to-origin requests to the origin server. As a result, the cache hit rate is decreased.
  • If the CDN node receives plenty of requests for content that has not been cached, the CDN node has to redirect these requests to the origin server. As a result, the cache hit rate is decreased.
  • If you modify the caching policy, the cache hit rate may be decreased.