[ZODB-Dev] Migration of obsolete BTrees to ZOPE 2.8

[nato]

>> It is no problem as long as you migrate while you are still using a Zope
>> 2.7 (ZODB 3.2) release.

I agree.

>I believe (but don't know) that the OP has many distinct, physically
>distributed installations of their product, involving many distinct
>databases.  I don't know how many "many" is ;-), or what kind of upgrade
>strategy would be acceptable, but I'm pretty sure they can't nurse each
>upgrade along "by hand".

We don't know how many, as we don't track licenses.
...

>> The migration is trivial as long as "BTree" and "Intset" are still
>> available. We use for example the following "BTree" migration.
>>
>Margie, does this help you?  Can you do migration "live" along these lines,
>or do you need on offline conversion script, or ...?

It doesn't really help. We are skipping distribution of ZOPE 2.7. I just
need a way to read them in ZOPE 2.8.  We need migration to be automatic on
installation of a new
version of WISE.