2009/8/28 Dragos Chirila <objectval...@gmail.com>: > Peter, > > Than you for your response. Please find below a few things: > > - I give up using sessions in the website's front and years ago :) > There is only one page left that is using them, when u subscribe to > our newsletter but I don't think that this affects because is used > rarely > It might be used anyway. It'll be empty (except the subscribe-to-newsletter page) all the time but it might still be in use. I think there is always a REQUEST.SESSION object.
> - I am using Yahoo Maps Ajax API to display maps; also some ajax calls > for our build in chat (only for logged users) That's unrelated. Yahoo! isn't using ZODB. > > So if the things above are causing read conflicts why only for this > particular object? There is nothing special or different with this > one... > It could be some other piece of code that tries to read from ZODB more than once and whatever it's trying to read might be something slow (slow for a computer). Have you tried running ZopeProfiler on your site to figure out if there are certain (ZO)DB related functions that are called either many many times or few but slow times. > Thanks again, > Dragos > > On Fri, Aug 28, 2009 at 12:19 PM, Peter Bengtsson<pete...@gmail.com> wrote: >> The fact that the class is Products.Transience.Transience.Increaser >> makes me suspect that you're using sessions and within the same >> session you make too many read requests to the ZODB. When the load is >> too high, after a certain amount of attempts Zope will say, "piss off! >> ...for a while and come back later". So it comes back later and works >> fine. >> Are you using lots of AJAX requests? That can sometimes cause read >> conflict errors. >> >> 2009/8/28 Dragos Chirila <objectval...@gmail.com>: >>> Hello everyone, >>> >>> I have a question regarding a database read conflict error. I would >>> appreciate any thoughts on this issue. >>> >>> I am using Zope 2.8.9.1-final, Python 2.3.7 with a ZEO server and 4 >>> clients for 6 months now. I have noticed that the event.log is filled >>> with read conflict errors like the one below: >>> >>> 2009-08-28T10:29:26 INFO ZODB.Conflict database read conflict error >>> (oid 0x09, class Products.Transience.Transience.Increaser) at >>> /VirtualHostBase/http/metropotam.ro:80/metropotam/VirtualHostRoot/Opera/loc4769172835-Ateneul-Roman/ >>> (21 conflicts, of which 0 were unresolved, since startup at Thu Aug 27 >>> 15:25:02 2009) >>> >>> This URL of the object is >>> http://metropotam.ro/Opera/loc4769172835-Ateneul-Roman . We have >>> around 2000 objects of the same type and this is *the only one* that >>> generates read conflict errors. >>> >>> I have tried a few things: >>> >>> 1. Edit object and recatalog it >>> 2. Rename it >>> 3. Delete object, pack database, create a new object and then rename >>> it to keep the URL alive >>> 4. checked the data.fs and got no errors (fstest.py) >>> >>> None of the above solved the problem; I still get a lot of conflicts. >>> >>> Is there a way to fix this? I found it very strange that I get >>> conflicts only for this object and for no other of the same type, even >>> in the same folder... >>> >>> Thank you, >>> Dragos Chirila >>> _______________________________________________ >>> Zope maillist - z...@zope.org >>> https://mail.zope.org/mailman/listinfo/zope >>> ** No cross posts or HTML encoding! ** >>> (Related lists - >>> https://mail.zope.org/mailman/listinfo/zope-announce >>> https://mail.zope.org/mailman/listinfo/zope-dev ) >>> >> >> >> >> -- >> Peter Bengtsson, >> work www.fry-it.com >> home www.peterbe.com >> hobby www.issuetrackerproduct.com >> fun crosstips.org >> > > > > -- > Dragos Chirila > objectval...@gmail.com > (+4) 0722 395375 > _______________________________________________ > Zope maillist - z...@zope.org > https://mail.zope.org/mailman/listinfo/zope > ** No cross posts or HTML encoding! ** > (Related lists - > https://mail.zope.org/mailman/listinfo/zope-announce > https://mail.zope.org/mailman/listinfo/zope-dev ) > -- Peter Bengtsson, work www.fry-it.com home www.peterbe.com hobby www.issuetrackerproduct.com fun crosstips.org _______________________________________________ Zope maillist - Zope@zope.org https://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope-dev )
