chore(popx): improve migration performance by removing unnecessary queries #730
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| if _, exists := appliedMigrationsMap[mi.Version]; exists { |
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Theoretically we could end up with an outdated view of already applied migrations, for example a migration that is applied 2 times (for whatever reason) or because there are more than one migration workers. Are we OK accepting that risk for the benefit it brings?
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Yes, theoretically this could be an outdated view.
The benefit will probably be a few hundred ms up to maybe 2s from my testing. This happens a couple of times per test run.
If you think this is a possible source of issues it is probably worth the extra few hundred ms in tests though.
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Sorry, I missed replying to this. I'm not sure to be honest. Migrations should be run as singletons but I guess the question is how do we deal with it if it isn't - so in the case of an operational mistake. Not sure to be honest...
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I like this PR. Why was it closed? @zepatrik |
This is most relevant during tests, but also Kratos has so many migrations it will significantly speedup it's migration command.