#26347: Saving ManyToMany field under race condition causes data loss
-------------------------------------+-------------------------------------
Reporter: hchargois | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: mysql transaction | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by shaib):
I've read the MySql documentation linked, and as far as I can understand
it does not allow a case where old records are seen when they are modified
(not to mention deleted) '''in the same transaction'''. That's not
"consistent read".
For us to accept that there is a data-loss race-condition under consistent
read, we'd need to see a detailed, step-by-step description of the
conflicting transactions, and how they reach the final result. As far as I
understand, there is no such scenario.
If a scenario as above cannot be given, then the data-loss bug is entirely
MySql's, and no fix for Django 1.8 is warranted.
The 1.9 situation describes correct behavior on all parts except for the
user interface, and I believe that is the level at which it should be
solved (i.e. disabling submission once "save" has been clicked).
--
Ticket URL: <https://code.djangoproject.com/ticket/26347#comment:5>
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