Request Coalescing in Nginx

Posted by Marcel Jackwerth on Server Fault See other posts from Server Fault or by Marcel Jackwerth
Published on 2012-06-08T10:06:08Z Indexed on 2012/06/08 10:41 UTC
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nginx

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cache

I have an image resize server sitting behind an nginx server.

On a cold cache two clients requesting the same file could trigger two resize jobs.

client-01.net GET /resize.do/avatar-1234567890/300x200.png
client-02.net GET /resize.do/avatar-1234567890/300x200.png

It would be great if only one of the requests could go through to the backend in this situation (while the other client is set 'on-hold').

In Varnish there seems to be such a feature, called Request Coalescing. However that seems to be a Varnish-specific term. Is there something similar for Nginx?

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