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To improve page render speed I am looking at implementing image sharding which serves images from the multiple subdomains. How can I ensure that the same image is retrieved from the same server?

I want to avoid a scenario like the one below where the same image is served from multiple domains: images1.domain.com/image1.gif images2.domain.com/image2.gif images2.domain.com/image3.gif images2.domain.com/image1.gif

We are running Java - is there any way to checksum/fingerprint the image-filename and based on that always assign it to the same server?

MagicDude4Eva
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1 Answers1

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Use an MD5 hash of the relative path to your content, then modulo this by the number of sharding domains you have. This presupposes that MD5 has a fairly even distribution across the final bit of the output (if you have two shards). My experience here was that it did. Here's a link to another question answering how to generate MD5 hash.

A modulo of a checksum might also suffice and be computationally quicker.

Community
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Josh Gallagher
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