I've following along the Plone 5.2 → Python 3 and ZODB → Python 3 guides—and also making sure eea.aliases in there, packing to zero days, etc.—and have gotten to the zodbverify point where, out of 583560 records, there are:
19197 ImportError: No module named grokcore.component.interfaces
1360 ImportError: No module named Archetypes.BaseUnit
352 ImportError: No module named ATContentTypes.content.document
242 ImportError: No module named blob.field
242 ImportError: No module named blob.content
91 ImportError: No module named Archetypes.ReferenceEngine
62 ImportError: No module named ATContentTypes.content.folder
16 ImportError: No module named ATContentTypes.content.link
And now I'm at a loss. The Archetypes → Dexterity migration seemed to go off without a hitch but given the above I'm not so sure. And we worked hard to scrub Grok from the code base but 19k instances in the database tells us we omitted a step (or it wasn't documented).
So, any ideas? Ignore these and brazenly/bravely/foolishly press on with zodbupdate anyway?
Thanks @pbauer. This helps enormously. The mere rebuild_relations took the grokcore count from 19k → zero. That's fantastic. I feel a lot more capable now in facing the remaining errant pickles.
The ZODB remains one of the "voodoo magic" parts of Zope that I try not to think about, but your linked article is fantastic.
Hi folks!
I've following along the Plone 5.2 → Python 3 and ZODB → Python 3 guides—and also making sure 
And now I'm at a loss. The Archetypes → Dexterity migration seemed to go off without a hitch but given the above I'm not so sure. And we worked hard to scrub Grok from the code base but 19k instances in the database tells us we omitted a step (or it wasn't documented).
So, any ideas? Ignore these and brazenly/bravely/foolishly press on with 
Thank you!
