[ZODB-Dev] Support for graceful ZODB Class renaming

[Guido van Rossum]

> >   3. A more sophisticated approach is to build a table, stored in the
> >      database providing a two-way mapping between a unique id and a
> >      class module and name.
> 
> An interesting idea.  I'm guessing that reducing the pickle sizes might
> help performance.

But we have another idea for reducing pickle sizes.  I'm planning a
new version of the pickle protocol that is much more efficient for
pickling new-style classes.  Since it's a new protocol version,
there's room for other improvements too.  One of those other
improvements will be a global registration of "pickle extension codes"
where certain classes can be designated by a two- or three-byte code.

(I'm writing a description of the new pickle protocol, but I have to
finish some other Zope work first.  I expect this to be in 2.3a2
though.)

--Guido van Rossum (home page: http://www.python.org/~guido/)