Hi,

in our Studentregistration portal we experience many conflict errors under heavy load many of them unresolved.

the configuration

ZEO-server running on one machine
4 Zope-Clients with CPS-3.4.2 with 4 threads each running on a second box, we are using the faster session product

all running Zope 2.9.3, python 2.4.3 on Ubuntu 4.0.3


a typical case looks like this:
about 5 or 6 messages in the log file with the oid 0x2b

2007-05-23T17:32:38 INFO ZPublisher.Conflict ConflictError at /VirtualHostBase/http/uniben.waeup.org:80/uniben/VirtualHostRoot/campus/students/S882364/study_course/create_level: database conflict error (oid 0x2b, class Products.faster.sessiondata.SessionDataContainer, serial this txn started with 0x036dd29c28404f33 2007-05-23 16:28:09.433877, serial currently committed 0x036dd29ed2491566 2007-05-23 16:30:49.285660) (780 conflicts (73 unresolved) since startup at Wed May 23 05:56:52 2007)

and finally

------
2007-05-23T17:32:38 ERROR Zope.SiteErrorLog http://uniben.waeup.org/campus/students/S882364/study_course/create_level
Traceback (innermost last):
  Module Zope2.App.startup, line 173, in zpublisher_exception_hook
  Module ZPublisher.Publish, line 121, in publish
  Module Zope2.App.startup, line 240, in commit
  Module transaction._manager, line 96, in commit
  Module Products.CPSCompat.PatchZODBTransaction, line 175, in commit
  Module transaction._transaction, line 433, in _commitResources
  Module ZODB.Connection, line 484, in commit
  Module ZODB.Connection, line 526, in _commit
  Module ZODB.Connection, line 554, in _store_objects
  Module tempstorage.TemporaryStorage, line 200, in store
ConflictError: database conflict error (oid 0x2b, class Products.faster.sessiondata.SessionDataContainer, serial this txn started with 0x036dd29c28404f33 2007-05-23 16:28:09.433877, serial currently committed 0x036dd29ed2491566 2007-05-23 16:30:49.285660)

Even though we have many write operations the write operations can't actually conflict, since each student only works on his own documents.

Any hints howto to get further insight into this problem is welcome.


--
Gruß Joachim

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