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[docs] Info rescheduling background migrations

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Bob Van Landuyt 2018-02-08 09:15:45 +01:00
parent 0478ff7cd4
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doc/development/background_migrations.md
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@ -94,6 +94,18 @@ jobs = [['BackgroundMigrationClassName', [1]],
BackgroundMigrationWorker.bulk_perform_in(5.minutes, jobs)
```
### Rescheduling background migrations
If one of the background migrations contains a bug that is fixed in a patch
release, the background migration needs to be rescheduled so the migration would
be repeated on systems that already performed the initial migration.
When you reschedule the background migration, make sure to turn the original
scheduling into a no-op by clearing up the `#up` and `#down` methods of the
migration performing the scheduling. Otherwise the background migration would be
scheduled multiple times on systems that are upgrading multiple patch releases at
once.
## Cleaning Up
>**Note:**