#21670: New Model.save() mechanism causes deadlocks in mysql transactions
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Reporter: err | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.6
(models, ORM) | Resolution:
Severity: Normal | Triage Stage: Accepted
Keywords: | Needs documentation: 0
Has patch: 0 | Patch needs improvement: 0
Needs tests: 0 | UI/UX: 0
Easy pickings: 0 |
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Comment (by vldmit):
This affects models with multi-table inheritance, as child model's primary
key is not auto incremented. Concurrent insert lead to deadlocks.
`select_on_save = True` in model's solve the problem. I believe this
option needs to be enabled for multi-table inheritance models, as inserts
are not guaranteed without it (at least when using MySQL).
--
Ticket URL: <https://code.djangoproject.com/ticket/21670#comment:4>
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