Performance improvements for photo serving

code.flickr.com

We’ve been working to make Flickr faster for our users around the world. Since the primary photo storage locations are in the US, and information on the internet travels at a finite speed, the farther away a Flickr user is located from the US, the slower Flickr’s response time will be. Recently, we looked at opportunities to improve this situation. One of the improvements involves keeping temporary copies of recently viewed photos in locations nearer to users.  The other improvement aims to get a benefit from these caches even when a user views a photo that is not already in the cache.

Regional Photo Caches

For a few years, we’ve deployed regional photo caches located in Switzerland and Singapore. Here’s how this works. When one of our users in Vietnam requests a photo, we copy it temporarily to Singapore. When a second user requests the same photo, from, say, Kuala…

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