Possible relstorage incompatibility about db HOT 4 OPEN

OK, I beat my head on this a bit today. The following combination works (pasts tests and import doesn't error) for me:

• Python 3.7
• RelStorage 2.1.1 (and presumably any version 2)
• ZODB 5.3.0

I'll make a 0.9.1 release soon that limits these versions.

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Hope someone could shed a light on this as I think this is exactly the right tool for a lot of solutions to problems out there...
Anyway:

after a little searching, I found this same issue on the referenced mailing list:
https://groups.google.com/g/newtdb/c/kxWreXzTGew

Please try installing RelStorage < 3. I'm afraid that RelStorage 3 involved large internal refactorings that were incompatible with netwdb.

This is not enough though, as an ImportError arises when doing import:

>>>import newt.db
ImportError: cannot import name '_cache_ring' from 'relstorage.cache' (/opt/xpend/venv/lib/python3.7/site-packages/relstorage/cache/__init__.py)

Hope someone could give here the "magic version numbers" for a working newtdb deploy ;)

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I agree, but I'm not working on anything anymore that can benefit and can't spend time maintaining it. Maybe someone else will step forward. Jim

This is perfectly understandable, time is precious! 😃

I also think it would be easier for someone to step forward if he could start studying the details and make experiments from a working codebase.

If you, or someone else, could spend a little time finding out the correct version of RelStorage (and/or other packages) for this project to stay alive, I would be immensely grateful.

Regards,
Enrico

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