[ZODB-Dev] Missing loader for multidatabase refs?
jim at zope.com
Fri Mar 30 07:21:37 EDT 2007
On Mar 29, 2007, at 7:04 PM, Sidnei da Silva wrote:
> While doing a 'pack' on a Zope instance that is using multiple
> databases, a KeyError 'n' happened. Upon investigation, we found out
> that the 'oid_loaders' dictionary used by 'referencesf' (in
> ZODB.serialize), which is in turn used by pack (presumably to find the
> oids referenced by an object), doesn't have a loader registered for
> A reference_type of 'n' means:
> Multi-database simple object reference. The arguments consist
> of a databaase name, and an object id.
> The ObjectReader class defined a few lines above 'referencesf' *does*
> know how to load a multi-database simple object reference.
> Now my question is, should 'referencesf' load those multi-database
> references, or should they be treated just like the 'weak references',
> by returning None, or should something else happen?
They should be treated as weak references, at least for now.
> Or maybe that
> reference shouldn't be there in the first place?
Where? There references should certainly be in the data records,
otherwise, cross-database references wouldn't work at all.
> This problem is preventing us from packing a database. It just falls
> dead with the KeyError 'n' when packing.
What version of ZODB are you using?
Jim Fulton mailto:jim at zope.com Python Powered!
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