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Re: ZMailer "hangs up" on message queues...

Thank you very much, this is indeed very helpful and shows some of the
quirks we were seeing came from.


Matti Aarnio wrote:
> On Wed, Jul 25, 2001 at 02:44:02PM -0700, Michael Loftis wrote:
> > We have ferreted out the quirkiness as it were, the filenames do have to
> > be numeric, the problem is we don't want to slow down to retrieve the
> > inode number for every file we inject into the queue, as this would
> > require a (Totally unecessary) stat (or fstat) call.  Complicating
> > matters slightly further is the fact we're using Perl as the engine.
>   The key thing is:  Decimal encoded unsigned-long value (say: 31 bits)
>   (The parsed value is used as a key in several internal databases;
>    all over, not only in router's input queue scanner.)
>   The key MUST be unique for the lifetime of the message in the spool.
>   Easiest method to create such has been the use of i-node number
>   of the spool-file, but we could use any magic a'la gettimeofday()
>   yields seconds + usecs, add there pid, and use the catenate.
>   Because the submission is intended to work even over NFS, some big
>   JUJU stuff steps in, and doing fstat() on open file is actually
>   your best bet.
>   The router uses  'atol()'  function internally..  Which MIGHT
>   treat names beginning with 0 as OCTAL...   Oh the joys of UNIX LIBC...
> > And actually you have to get the inode number, then convert it to ASCII
> > (OK so itoa isn't that expensive, but still...)
> >
> > We've found that there is definetly an upper limit as to the length of
> > the filename that it will reliably process, if it's over this limit then
> > the system chunks out one at a time for a while, vainly trying to search
> > for readable messages.
> >
> > Is there any documentation on *Exactly* what all the restrictions and
> > such are for the zmailer queuefiles that are dropped in router/ ?
>   http://zmailer.org/zman/zadm-queues.html#ZADM-QUEUE-MSGSUBMISSION
> > Thanks,
> >
> > Michael
> --
> /Matti Aarnio   <mea@nic.funet.fi>
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