[mnet-devel] Ickle me, pickle me, tickle me too...

[Wes Felter]

On Fri, 2003-08-08 at 07:23, Zooko wrote:
> > I question Zooko's suggestion of overwriting the checkpoint file 
> > in-place; I wonder what could happen during a crash. Maybe it's better 
> > to write the checkpoint to a new file, fsync it, and then rename it 
> > over the old one.
> 
> That would be guarantee that either the old or the new version is in place 
> (assuming certain guarantees from the underlying filesystem), right?

Right.

> But we still have the possibility that it is the old version, which can cause 
> problems.

As I see it, you have two choices:

Rewrite the index in-place, allowing it to become hopelessly corrupted
in a crash.

Write the index atomically, allowing the possibility that after a crash
you might see the old version.

-- 
Wes Felter - wesley at felter.org - http://felter.org/wesley/


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