On Tue, Jan 31, 2012 at 8:27 AM, Johannes Waldmann
Can I really rename old.T => new.T_orig ? It looks as if then tries to load the wrong acid-state snapshot.
The name of your data type doesn't matter as acid-state doesn't store that on the disk.
I think it does - because file names are state/T/*.log and so on?
The function 'openLocalState' in AcidState uses the name of the passed in state type to locate the log files on disk. So as long as you always call 'openLocalState' with types of the same name to represent the same state you'll be fine - this is why it is safe to rename your old type, because you call 'openLocalState' with the new type. Alternatively, you can call 'openLocalStateFrom', which doesn't base anything on names of types (you can tell because there is no 'Typeable' constraint on its arguments). Antoine
J.W.
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