Comment 1 for bug 1648603

Some more facts:

- The snap is about 380MB

- The LP side doesn't seem particularly interesting. From cjwatson:
  """
  [2016-12-06 19:19:51,073: INFO/Worker-3] Starting new HTTPS connection (1): upload.apps.ubuntu.com
  [2016-12-06 19:24:49,265: WARNING/MainProcess] Soft time limit (300.0s) exceeded for lp.services.job.celeryjob.CeleryRunJobIgnoreResult[SnapStoreUploadJob_34011252_4f15615a-3667-49ca-8641-830274abb55b]
  [2016-12-06 19:24:49,265: ERROR/Worker-3] Failure in _doOops: SoftTimeLimitExceeded()
  (with a few uninteresting things from the same worker in between, basically just transaction management waffling)
  the traceback is otherwise uninformative
  """

- The CUD logs are also not helpful. From thomi:
  "I've completely failed to find anything interesting in the CUD logs. <snip> I couldn't find any POST in the CUD logs that remotely matched that timestamp so I wonder if this was something 'earlier' than the app units"

- Ted reports that sometimes just retrying the upload in LP works. I haven't seen that myself, but apparently it can work.

- I've even seen LP get stuck in the "uploading" state, never noticing a timeout. For example, https://launchpad.net/~unity-team/+snap/unity8-session-silo/+build/12636 -- as of the time of this writing -- is stuck at " Store upload in progress"