Comment 1 for bug 1340993

I should add some more detail about our setup. SSL is not being offloaded in any environment and is being handled via the glance-api and glance-registry services. We increased the number of workers to 40, to better handle multiple downloads/SSL overhead. In production we are using F5’s or A10’s for load balancing in our dev/test/stage environments we are using haproxy. The issue exists in all environments. Also, in testing it did not matter the number of glance-api servers we had in rotation. To simplify troubleshooting, I had disabled glance-api on all but one server. So most of the testing was done from a single compute node using multiple clients to a single glance-api instance (with 40 workers). To add some additional detail I am running on Centos 6.5, and I have already tried upgrading eventlet, greenlet, pyOpenSSL, pycryptography to their latest versions on both the client and the server and it did not help.

If we turn off ssl in glance-api and the client, then the 3 simultaneous downloads work without issue.