[Zope] error: Z2 CONFLICT Competing writes

[Chris McDonough]

Your probuct causes multiple simultaneous ZODB writes, likely because
you have a method which assigs a value to an instance attribute in an
instance of one of your classes, and multiple threads (web users) are
trying to execute the method which does this at the same time.

Search for "conflict errors" in the mail list archives for more info. 
This error is possibly normal depoending on your application.

zope-mailinglist wrote:
> 
> hello all together
> 
> i've got the following problem:
> 
> i wrote a python product which inherits from ofs.folder
> i defined some HTMLFiles in it like this:
> 
> index_html = (HTMLFile('dtml/representation/site_index_html', globals()))
> 
> now when i access the files via web i get the following error:
> 
> 2001-06-05T12:25:21 INFO(0) Z2 CONFLICT Competing writes at, <the path to
> the object>
> Traceback (innermost last):
>   File D:\zope231\lib\python\ZPublisher\Publish.py, line 175, in publish
>   File D:\zope231\lib\python\Zope\__init__.py, line 235, in commit
>   File D:\zope231\lib\python\ZODB\Transaction.py, line 300, in commit
>   File D:\zope231\lib\python\ZODB\Connection.py, line 281, in commit
> ConflictError: '\000\000\000\000\000\00013'
> 
> note: at this time there are no management windows open - only the frontend
> 
> this is my system info:
> 
> Debug Information
> 
>   a.. Zope version: Zope 2.3.1 (binary release, python 1.5.2, win32-x86)
>   b.. Python version: 1.5.2 (#0, Jul 30 1999, 09:52:18) [MSC 32 bit (Intel)]
>   c.. System Platform: win32
>   d.. Process ID: 1600 (312)
>   e.. Running for: 19 min 22 sec
> the page shows up right - but the error appears in the command window .(
> 
> thanks in advance
> 
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