Comment 13 for bug 1518431

Stuart, Kairat,

This bug is hard to reproduce, TBH. The race happens in a combination of Glance's v2 behavior and swift's driver. This is not *entirely* Glance's fault, though. The Glance "weird" part is not being able to recognize "0-sized" chunks before submitting them. However, this is being refactored a bit by one of our current swift specs (need to find the link).

The swift issue is that the DELETE is hitting the swift node before the last chunk is written/available. This could be caused by unsynchronized clocks or just a race condition.

I've managed to reproduce it in one of our installers CI systems with some frequency but I have yet to find a deterministic way to do so. Meanwhile, I can confirm this issue exists.

While it's true that part of this code is being refactored by the "buffered chunk writer" spec, I still think we should fix it as it's eligible for backport.

Hope the above helps clarifying a bit the real problem