Glance WSGI image upload fails

[Alvaro Lopez]

Hi there.

When running latest Havana Glance behind an Apache httpd server with mod_wsgi, an image upload fails with the following error:

    2014-03-27 14:15:25.656 7292 DEBUG glance.api.v1.upload_utils [-] Client disconnected before sending all data to backend upload_data_to_store /usr/lib/python2.7/dist-packages/glance/api/v1/upload_utils.py:231

Narrowing this down, this is similar to this ML thread (except the error shown): http://lists.openstack.org/pipermail/openstack-dev/2013-December/022510.html

Applying the patch in that thread, solves the error.

[Alvaro Lopez (aloga)]

@arnaudleg: Are you working on this? I have some code ready and I can contribute it.

[Arnaud Legendre (arnaudleg)]

@aloga: go ahead

[Jay Wang (jaywang144)]

I tried to recreate the problem but not successful. I used the a wsgi file at /opt/stack/horizon/openstack_dashboard/wsgi/django.wsgi for testing. Then basically run it through the chunkreadable and chunkiter functions in the utils. However, I don't seem to encounter any read error even the last read size is greater than the data left. The code base I use is from Juno. Is it still a problem? Or I should use a different wsgi file for recreating the problem. Please advise if this is still a valid bug. Thanks.

[Brian Rosmaita (brian-rosmaita)]

Using mod_wsgi is not recommended with Glance. The mod_wsgi protocol does not support Transfer-Encoding: chunked and therefore makes it unsuitable for use with Glance. However, you could theoretically deploy Glance using mod_wsgi but it will fail on any requests that use a chunked transfer encoding.

see: https://docs.openstack.org/glance/latest/admin/apache-httpd.html