Implement a read-only mode about lapis HOT 13 CLOSED

Thanks for the issue, Lapis should definitely have this feature!

from lapis.

Yeah, having a way to read data without imposing a session lock would be great!

from lapis.

Maybe it runs the migration code locally but doesn't save that data back?

from lapis.

I've been thinking about this and I'm not sure how it should work with migrations. Would you expect this to return API to return data with an outdated migration version?

from lapis.

Either way feels like it's a 'gotcha' territory.

from lapis.

Maybe it runs the migration code locally but doesn't save that data back?

I think applying a temporary unsaved migration is a necessary compromise for the proposed read-only mode.

I certainly don't have a use case for reading data that is out of date, so I think the natural step there is just running whatever migration is needed to bring the data up to date.

from lapis.

Even if we did run the migration, you could have a situation where a server reads a document with a migration version higher than its own.

from lapis.

That could still happen on it's normal write mode though? So I don't think it's in the scope of this issue?

from lapis.

If you load a document that has a higher migration version than the servers, it will error and not load the document. We could do that here as well. I just don't know the specific use-cases people have for a read-only mode, so I don't know if that's acceptable.

from lapis.

I think it makes the most sense to return the data migrated to the version that the server calling it expects.

from lapis.

I think it makes the most sense to return the data migrated to the version that the server calling it expects.

I agree, but if it is passed the server's migration version, you would expect it to error then?

from lapis.

I think it makes the most sense to return the data migrated to the version that the server calling it expects.

I agree, but if it is passed the server's migration version, you would expect it to error then?

Yes

from lapis.

Resolved with #59.

from lapis.