Conflicterror Database Conflict Error

5, and is updated regularly. There have been many changes in this version, so if you are using Plone 4 do consult the Plone 4.3 Documentation Introduction Quickstart Working with Content Adapting

Zodb Database Conflict Error

& Extending Plone Installing, Managing and Updating Plone Installing Plone Guide to conflicterror database conflict error zenoss deploying and installing Plone in production Plone Upgrade Guide Troubleshooting Basic troubleshooting Exceptions and common tracebacks Buildout troubleshooting

Conflict Virus

Unicode encoding and decoding Image troubleshooting Database and transactions troubleshooting Introduction BLOBs and POSKeyErrors Transactions ConflictError How to debug which object causes ConflictErrors If every transaction appears as write transaction How to debug it zeostorage Client has seen newer transactions than server Updating objects created by older code Manually Removing Local Persistent Utilities Automating Plone Deployment Developing for Plone Appendices About this documentation License for Plone Documentation Asking for help Table Of Content Database and transactions troubleshooting¶ Description How to debug and fix ZODB database problems in Plone Introduction BLOBs and POSKeyErrors Transactions ConflictError How to debug which object causes ConflictErrors If every transaction appears as write transaction How to debug it zeostorage Client has seen newer transactions than server Updating objects created by older code Introduction¶ This document contains information to fix and debug ZODB databases with Plone. BLOBs and POSKeyErrors¶ The Plone CMS from version 4.x onwards stores files and images uploaded to the ZODB as blob. They exist in a var/blobstorage folder structure on the file system, files being named after (opaque) persistent object ids. When using the default backend, the objects themselves, without file payload, are stored in an append-only database file called filestorage and usually the name of this file is Data.fs. If you copy the Plone site database object data (Data.fs) and forget to copy the blobstorage folder(s), or if data gets out of the sync during the copy, various problems appear on the Plone site: You cannot access a content item for which the a corresponding blob file is missing from the file system; you cannot rebuild the por

order to try to avoid throwing away potentially computationally expensive transactions. The risk of harming data integrity should not be underestimated. Writing conflict resolution code takes some responsibility for transactional integrity away from the ZODB, and puts it in the hands of the developer writing the conflict resolution code. The current conflict resolution code is implemented with a storage mix-in found in ZODB/ConflictResolution.py. The idea's proposal, and an explanation of the interface, can be found http://docs.plone.org/manage/troubleshooting/transactions.html here: http://www.zope.org/Members/jim/ZODB/ApplicationLevelConflictResolution Here is the most pertinent section, somewhat modified for this document's use: A new interface is proposed to allow object authors to provide a method for resolving conflicts. When a conflict is detected, then the database checks to see if the class of the object being saved defines the method, _p_resolveConflict. If http://docs.zope.org/zope3/Code/ZODB/ConflictResolution.txt/index.html the method is defined, then the method is called on the object. If the method succeeds, then the object change can be committed, otherwise a ConflictError is raised as usual. def _p_resolveConflict(oldState, savedState, newState): Return the state of the object after resolving different changes. Arguments: oldState The state of the object that the changes made by the current transaction were based on. The method is permitted to modify this value. savedState The state of the object that is currently stored in the database. This state was written after oldState and reflects changes made by a transaction that committed before the current transaction. The method is permitted to modify this value. newState The state after changes made by the current transaction. The method is not permitted to modify this value. This method should compute a new state by merging changes reflected in savedState and newState, relative to oldState. If the method cannot resolve the changes, then it should return None. C

concern?Everything looks ok, with exception of sporadic gaps http://zenoss-users.zenoss.narkive.com/kvPSndWq/upgrade-2-2-failure-conflicterror-database-conflict-error in graphs that I'm trying to resolve in another thread.event.log[code]2008-09-25T08:37:22 INFO ZODB.Conflict database conflict error (oid 0x2b, class Products.ZenUtils.PObjectCache.PObjectCache) at /zport/RenderServer/render (68 conflicts, of which 2 were unresolved, since startup at Wed Sep 24 17:19:41 2008)------2008-09-25T08:37:22 ERROR Zope.SiteErrorLog http://nms.amyskitchen.net:8080/zport/RenderServer/renderTraceback (most database conflict recent call last):File "/usr/local/zenoss/zenoss/lib/python/Zope2/App/startup.py", line 167, in zpublisher_exception_hookv.reraise()File "/usr/local/zenoss/zenoss/lib/python/ZPublisher/Publish.py", line 120, in publishtransactions_manager.commit()File "/usr/local/zenoss/zenoss/lib/python/Zope2/App/startup.py", line 233, in committransaction.commit()File "/usr/local/zenoss/zenoss/lib/python/transaction/_manager.py", line 84, in commitself.get().commit(sub)File "/usr/local/zenoss/zenoss/lib/python/transaction/_transaction.py", line 381, in commitself._saveCommitishError() # This raises!File "/usr/local/zenoss/zenoss/lib/python/transaction/_transaction.py", line 379, in commitself._commitResources()File "/usr/local/zenoss/zenoss/lib/python/transaction/_transaction.py", line 424, database conflict error in _commitResourcesrm.commit(self)File "/usr/local/zenoss/zenoss/lib/python/ZODB/Connection.py", line 462, in commitself._commit(transaction)File "/usr/local/zenoss/zenoss/lib/python/ZODB/Connection.py", line 495, in _commitraise ConflictError(object=obj)ConflictError: database conflict error (oid 0x2b, class Products.ZenUtils.PObjectCache.PObjectCache)------2008-09-25T13:35:29 INFO ZODB.Conflict database conflict error (oid 0x2b, class Products.ZenUtils.PObjectCache.PObjectCache) at /zport/RenderServer/render (99 conflicts, of which 3 were unresolved, since startup at Wed Sep 24 17:19:41 2008)Many thanks,-------------------- m2f --------------------Read this topic online here:http://forums.zenoss.com/viewtopic.php?p=25604#25604-------------------- m2f -------------------- coyote 2008-09-26 22:59:29 UTC PermalinkRaw Message You may want to delete your cache file,zenoss stoprm $ZENHOME/var/zenhub-1.zeczenoss start-------------------- m2f --------------------Read this topic online here:http://forums.zenoss.com/viewtopic.php?p=25605#25605-------------------- m2f -------------------- ericv 2008-09-30 00:45:36 UTC PermalinkRaw Message Thanks,It seem to have helpedOnly one conflict and was resolved. So I think I'm good.Now, onto other unresolved issues.Thanks again.Code:2008-09-29T14:10:35 INFO Zope Ready to handle requests------2008-09-29T14:18:00 INFO ZODB.Conflict database conflict e