What is the Cache hit ratio?

A cache hit ratio is an important metric that is used to measure the success of a CDN server’s cache system. The cache hit ratio portrays the percentage ratio of the total number of cache hits and misses to the number of cache hits.

Let’s understand with an example. If a cache hit ratio is 70%, that means 70% of the requested content is served from the cache, and the rest 30% must be retrieved from the original server.

A Google Cloud CDN (Content Delivery Network) uses the Google global network to serve static resources such as media files like images and videos, CSS stylesheets, JavaScript files, and so on with lower latency and higher transfer speed. This cloud CDN will permit users to access the webpage content from the nearest edge location. Google Cloud CDN also reduces the stress on the backend server by sharing the content with the cloud CDN, which is available in 130+ edge locations.

Google Cloud CDN works with a load balancer to deliver the content to the end user. When users request any content from a website, that request will arrive at the edge of the Google network that is nearest to them.

• If the requested content is not present at the edge location server, Google Cloud CDN (Content Delivery Network) retrieves the requested content from the backend, which means the original server. This is also known as “Cache Miss.”
• In a content delivery network such as Google Cloud CDN, if the requested content is present, then CDN can fulfill the request of the user. This is known as a “Cache Hit”