Re: request-route

[kragen () dnaco net (Kragen Sitaker)]

On Tue, 29 Jul 1997, John Macdonald wrote:
> Eric Bennett wrote :
> || On Tue, 29 Jul 1997, Zoltan Hidvegi wrote:
> || > lock files in a world-writable directory from a bourne-shell script.
> ||
> || I have done this by creating directories instead of files: only one mkdir
> || will complete.
>
> Nope, you;ve got it backwards.  To begin, the same basic problem
> applies to both.  If an operation succeeds, but the
> acknowledgement gets lost on the network, then the time-out
> cause a retry which will fail because the target item exists.

I believe that most implementations of NFS maintain a cache of the most
recent few non-idempotent operations (mkdir, rm, rmdir, etc.) and their
results; if the request is retried, the result is resent.  Can someone who
has read the code confirm or deny this?

Kragen