Re: filesystem oops?

Branko Čibej <brane@xbc.nu> writes:
> >No. We would have never gotten the current ID if its predecessor
> >hadn't existed.
> >
>
> Not so. We *can* get discontinuities, because of aborted transactions.

Hmmm... not so, I think:

   txn A creates node 15.3 based off 15.2
   txn B creates node 15.2.1.1 based off 15.2 (because 15.3 already taken)
   txn A aborts
   txn B commits

The whole 15.3+ line doesn't exist, and everything in the
15.2.1... line will correctly name 15.2 as its predecessor.

If someday a 15.3 *does* succeed in getting committed, then some nodes
might get based on it.

In other words, increments are only ever done on numbers that have
been successfully committed. Numbers in txns are never used as
predecessors.

-Karl

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Received on Sat Oct 21 14:37:04 2006