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uWSGI dataset request error

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uWSGI dataset request error

Dawes, Gwen
Hi all,
We have a simple Galaxy instance running on a webserver on our cluster. Recently, we've seen an upswing of student usage, and I'm trying to look into switching over from a single paster instance to a system using uWSGI to spread the load. Currently we're running the 17.01 release, but we saw this same behaviour on the 16.10 one.

I've followed all the steps on the wiki related to setting up uWSGI, but we're encountering the following problem, in the words of one or our primary users:
"It is not possible to download/save files from a history. Nothing happens when clicking the floppy disk icon. ... It is possible to view files (clicking the eye icon) that are displayed other than as raw data: tables, html. png does not work. Preview of large text files (i.e. fastq) works, but when selecting display all, the same error message is shown. The small preview in the history (dataset-peek) works."

We see the following issue when trying to view raw data:
The requested URL /datasets/<a_dataset_id>/display/ was not found on this server.

Currently apache (2.4.6) is configured using mod_proxy_uwsgi using:

ProxyPass / uwsgi://localhost:14001/

I can see that the requests are being sent over to uwsgi (in its logs):

[pid: <pid>|app: 0|req: 95/241] <my_ip> (<my_user>) {82 vars in 1983 bytes} [Mon May  1 15:19:16 2017] GET /datasets/<a_dataset_id>/display?to_ext=fasta => generated 0 bytes in 50 msecs (HTTP/1.1 200) 6 headers in 281 bytes (1 switches on core 1)

But we see that it's giving a zero length response.

Does anyone know what's going on here? I can't find a way to increase logging further to debug this error, but it's preventing us from using uwsgi to scale out this service.

If anyone can make a good suggestion or wants extra details, please let me know.

Thanks,
Gwen Dawes
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