[Zope] Zope=ZEO connection

[Paul Winkler]

On Tue, Feb 07, 2006 at 06:18:49PM -0800, Dennis Allison wrote:
> 
> Zope 2.9.0
> Python 2.4.2
> Amd dual Opteron
> Linux
> 
> I am seeing occasional (several per day)  Zope crashes under load.  The 
> event.log immediately before and after the crash looks like:
> 
> 
> 2006-02-06T14:07:20 INFO ZPublisher.Conflict ConflictError at 
> <some path>: 
> database conflict error (oid 0x086e, class BTrees._OOBTree.OOBTree, serial 
> this txn started with 0x03633ca95f75e900 2006-02-06 22:01:22.373575, 
> serial currently committed 0x03633caf59114244 2006-02-06 22:07:20.875176) 
> (463 conflicts (0 unresolved) since startup at Mon Feb  6 08:21:26 2006)
> ------
> 2006-02-06T14:09:09 INFO ZServer HTTP server started at Mon Feb  6 
> 14:09:09 2006
>         Hostname: x-harper
>         Port: 8081
> 
> which also triggers a connection drop and restarBt of ZEO.
> 
> The failure happens silently even with 
> 
> <eventlog>
>   level ALL
>   <logfile>
>     path $INSTANCE/log/event.log
>     level info
      ^^^^^^^^^^

fwiw, you're still only logging at INFO.

> What sort of Zope failure can cause this sort of behavior?  What's the 
> best approach to get more information to localize the failure.

I really don't know. But I'd have a look at the trace log,
if you've got that configured (I routinely do).
Maybe you could spot some patterns right before the crashes?
*shrug*

-- 

Paul Winkler
http://www.slinkp.com