On 01/26/2013 02:36 AM, tulumvinh@gmail.com wrote:
> Hello everyone,
>
> My company processes millions of requests for file uploads/downloads and we
> are looking at Nginx to replace Apache. We are running into a problem that
> I hope you can help -- I have searched the web and even read Nginx HTTP
> Server book by Clement Nedelcu.
>
> At a high level, the flow of a request through our system is as follows:
> user agent posts the data to upload --> Ngixn acting as a reverse proxy
> --> Object store -> post action of passing request to Uwsgi.
>
> Problem: when uploading a large file (~ 100MB) , the post action is
> failing. The error message seen in error.log is "8 sendfile() failed (9:
> Bad file descriptor) while sending request to upstream," message. This use
> case occurs even if no load on the system,
>
> When I enable "debug", I see that after the Nginx streams the bytes to the
> object store, the temp file is deleted. When the post action is executed it
> fails as the temp file is gone.
>
>
> *Note: this error is NOT seen when upload small files.

I would store the file in some temporary space on frontend, and then forwarded it to the storage backend.

--
With best regards,
Gregory Edigarov

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