I have to label something in a "strong monotone increasing" fashion. Be it Invoice Numbers, shipping label numbers or the like.
- A number MUST NOT BE used twice
- Every number SHOULD BE used when exactly all smaller numbers have been used (no holes).
Fancy way of saying: I need to count 1,2,3,4 ... The number Space I have available are typically 100.000 numbers and I need perhaps 1000 a day.
I know this is a hard Problem in distributed systems and often we are much better of with GUIDs. But in this case for legal reasons I need "traditional numbering".
Can this be implemented on Google AppEngine (preferably in Python)?