fix: set default mysql isolation level to 'READ COMMITTED' #30174
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#28628 had the virtuous intent to align mysql and postgres to a consistent isolation_level (READ COMMITTED), which seems fitted for Superset. Though instead of doing this, and because sqlite doesn't support that specific one, it set the default to SERIALIZABLE which seems to exist by many engines. Here I'm realizing we need dynamic defaults for isolation_level based on which engine is in used, which can't be done in config.py as we don't know yet what engine will be set by the admin at that time. So I thought the superset/initialization package might be the right place for this. Open to other solutions, but I think this one works. * using DB_CONNECTION_MUTATOR, but that one applies only to analytics workloads, not the metadata db
This was referenced Sep 6, 2024
villebro
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Sep 6, 2024
superset/initialization/__init__.py
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| if not isolation_level and self.config["SQLALCHEMY_DATABASE_URI"].startswith( | ||
| "mysql" | ||
| ): |
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I kinda liked John's cleaner way of extracting the backend name:
backend = make_url(SQLALCHEMY_DATABASE_URI).get_backend_name()Also, weren't we supposed to do READ COMMITTED by default for Postgres, too?
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ok, I addressed comments, lover how pre-commit caught something around make_url not being safe to use so I found I can use make_url_safe
villebro
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Sep 6, 2024
Co-authored-by: Ville Brofeldt <33317356+villebro@users.noreply.github.com>
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Wondering since the original pr is a breaking change if we should pull it out of 4.1 and wait until 5.0 to incorporate it. |
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@villebro do you think that's mergeable? |
villebro
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Sep 9, 2024
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| docker/**/*.sh text eol=lf | |||
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Yup, Ill search for say a model name and the erd.svg muddies my git grep
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Co-authored-by: Ville Brofeldt <33317356+villebro@users.noreply.github.com> (cherry picked from commit 6baeb65)
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#28628 had the virtuous intent to align mysql and postgres to a consistent isolation_level (READ COMMITTED), which seems fitted for Superset. Though instead of doing this, and because sqlite doesn't support that specific one, it set the default to SERIALIZABLE which seems to exist by many engines.
Now SERIALIZABLE can create issues like this one: #30064 and upping the isolation level can have serious load implications for large deployments (or databases that are fitted "just-right" for their loads, like someone may use a tiny RDS for Superset)
Here I'm realizing we need dynamic defaults for isolation_level based on which engine is in used, which can't be done in config.py as we don't know yet what engine will be set by the admin at that time. So I thought the superset/initialization package might be the right place for this.
Open to other solutions, but I think this one works.
alternative considered