[ZODB-Dev] ExternalMount, FileStorage and Undo

[Chris Withers]

Jim Fulton wrote:
>> What is the problem with undo and mounted storages?
> 
> Zope undo currently looks only at the main database. For mounted storages,
> you want it to look at the mounted database where you are, or at all 
> databases,
> which is much harder.

FWIW, we have packing working on multiple mounted FileStorages where only some 
of the mounted DBs should be packed.

>> Could there be a problem mounting many FileStorage in one base instance?
> 
> Not that I know of, but no one has tried it.

We have a couple of large ClientStorages (well, the FileStorage's on the 
StorageServer are large ;-) mounted into another ClientStorage. Not sure if that 
counts as 'many' :-S

As Jim said, Undo goes weird, but we did find it almost usable, IIRC. Then 
again, I may be remembering somethign different :-S

cheers,

Chris - is it just me or is it Monday? Hmmm... probably both...