You might try placing the session data container in the main ZODB
FileStorage (or ZEO storage if you use ZEO) to see if it demonstrates
fewer conflicts there than using one contained in a
TemporaryStorage. If you use ZEO, you will need to ensure that the
Products.faster package can be imported from within the storage
server itself (the storage server performs conflict resolution as
opposed to each client doing it).
On May 23, 2007, at 1:12 PM, Joachim Schmitz wrote:
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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