MailScanner under openvz

[Julian Field]

On 27/04/2010 01:09, Nick Brown wrote:
>
> On Mon, 2010-04-26 at 08:46 +0100, Julian Field wrote:
>
>   
> >  
> >  So I dropped the kids to "2" and it starts, all good as it should.
> >  
> >  26227 ?        Ss     0:00 MailScanner: master waiting for children,
> >  sleeping
> >  26232 ?        S      0:02 MailScanner: waiting for messages
> >  28345 ?        S      0:02 MailScanner: waiting for messages
> >  
> >  Except.. (yep there's always an "except")...
> >  Often, a child grabs the batch, then, the other kid grabs it,
> >  processing it twice, resulting in the recipient getting two copies of
> >  the message.
> That's a locking fault.
> >  
>
> That's what I thought but all perms seem correct.
>
> I’ve never looked at how MailScanner handles file locking – however 
> have seen a similar issue previously where the filesystem was stored 
> over NFS (Which requires some rejigging to get ‘file locking support’ 
> out of the box)
>
MailScanner does not support shared queues over NFS. NFS file locking is 
a total nightmare, you're trying to impose a stateful system 
(file-locking) on a stateless file server protocol (NFS).
>
> however the end user was not aware due to the fact it was a Virtuozzo VE.
>
> Nick.
>

Jules

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