[Zope-dev] ZODB Competing read/writes: How to find out which attribute?

[Hermann Himmelbauer]

Am Freitag 09 Oktober 2009 19:12:09 schrieb Shane Hathaway:
> Hermann Himmelbauer wrote:
> > Hi,
> > I once in the while get the following warning in my Zope 3 log, which I'd
> > like to resolve:
> >
> > 2009-10-07T14:35:41 WARNING ZopePublication Competing writes/reads
> > at
> > /BSPSite/act/++vh++http:zis.act.at:80/bankneu/++/c/acc/booklist/index.htm
> >l: database conflict error (oid 0x7a5d, class BTrees.OOBTree.OOBTree,
> > serial this txn started with 0x0381388ca6804966 2009-10-07
> > 12:28:39.023700, serial currently committed 0x03813893b087d0cc 2009-10-07
> > 12:35:41.374343)
>
> That URL looks like it should only be reading the database, but the fact
> that you get a conflict error suggests that the code behind that URL is
> writing to the database.  If I were you, I would first ensure that read
> operations never write to the database.

That's exactly the problem - it's a read operation and there should not be any 
write operation involved. However, it's hard to find out where the write 
operation in my code occurs, I can't find it in the view, maybe there's 
something in the authentication code, but I'd have to dig deep through my 
source. So It would be extremely helpful to know a faster way to find out 
what code triggered this warning.

Best Regards,
Hermann

-- 
hermann at qwer.tk
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