Hello guys,

we are currently facing the issue, that the image creation from a volume takes very long. We were able to trace the problem to the python-glance-client. There we can reproduce it with the "glance image-upload" command. Uploading the same image with the openstack-client and the command "openstack image create --file" works as fast as expected. With the openstack client a 4gb image takes ~30s while it can take up to 20min if it is done with the glance client.

We can see the glance-server spawning a new thread to handle the request. For some reason, the used memory of this thread rises and drops over and over again until it finished after a very long time.

Do you have any idea, what can cause this behavior?

Some pieces of information about our system:
- Glance Yoga with S3 Backend
- Glance Client version 4.3.0 or 3.6.0