[Zope] ZODB.POSException.ReadConflictError
egroup at mac.com
egroup at mac.com
Tue May 3 12:18:59 EDT 2005
Chris,
Thank you for that reference (I have an older dead trees version). Now
I understand that these errors happen, but what I don't understand is
why my users see them ("The requests which experience conflict errors
will be retried automatically by Zope, and the end user should *never*
see one." emphasis in original).
Is it simply a matter of too much traffic for the server? This is a
dual 2.3 GHz box, 2G of RAM, 10,000 RPM SCSI drives (two, mirrored as 1
logical RAID 1 drive), serving 8,000 members (now about 1,000 new
members a month, hence the urgency), 80,000 visits per month, 400,000
page views per month. Is it time to dip my toe into ZEO?
Marshall
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n: Marshall Mayer
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On May 3, 2005, at 8:14 AM, Chris McDonough wrote:
> This is actually normal. See the end of
> http://www.plope.com/Books/2_7Edition/Sessions.stx ("Conflict Errors")
> for a short explanation.
>
> On Tue, 2005-05-03 at 08:00 -0700, egroup at mac.com wrote:
>> I'm getting a ZODB.POSException.ReadConflictError on my Plone 2.0.5
>> site (Zope 2.7.3, Python 2.3.4 on Mac OS X Server 10.3.9). It happens
>> most frequently when members try to register on my site (about 10% of
>> the time), but occasionally happens when other pages are accessed (no
>> pattern). Alternatively, a blank page is returned. No messages appear
>> in the Zope or Plone error log.
>>
>> I've reproduced the error messages below, all of which resulted from a
>> member registration. I received 7 error reports were from the past two
>> days, with two types of errors. Of the two types of errors, the "oid
>> 0x07e8, class BTrees.IOBTree.IOBucket" error was seen 5 times and the
>> "oid 0x08, class Products.Transience.Transience.Length2" error was
>> seen
>> twice.
>>
>> Is there something wrong with my installation or is there something
>> wrong with my data.fs file? How do I correct either?
>>
>> Marshall
>>
>> --
>>
>> TYPE 1 ERROR
>>
>> Site Error
>>
>> An error was encountered while publishing this resource.
>>
>> ZODB.POSException.ReadConflictError
>> Sorry, a site error occurred.
>>
>> Traceback (innermost last):
>>
>> * Module ZPublisher.Publish, line 175, in publish_module_standard
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 139, in publish
>> * Module Zope.App.startup, line 163, in zpublisher_exception_hook
>> * Module ZPublisher.Publish, line 101, in publish
>> * Module ZPublisher.mapply, line 88, in mapply
>> * Module ZPublisher.Publish, line 39, in call_object
>> * Module Products.CMFFormController.ControllerPageTemplate, line
>> 80, in __call__
>> * Module Products.CMFFormController.BaseControllerPageTemplate,
>> line 39, in _call
>> * Module Products.CMFFormController.ControllerBase, line 243, in
>> getNext
>> * Module Products.CMFFormController.Actions.TraverseTo, line 36,
>> in
>> __call__
>> * Module ZPublisher.mapply, line 88, in mapply
>> * Module ZPublisher.Publish, line 39, in call_object
>> * Module Products.CMFFormController.FSControllerPythonScript,
>> line
>> 102, in __call__
>> * Module Products.CMFFormController.FormController, line 354, in
>> validate
>> * Module ZPublisher.BaseRequest, line 156, in items
>> * Module ZPublisher.HTTPRequest, line 1178, in get
>> * Module Products.Sessions.SessionDataManager, line 94, in
>> getSessionData
>> * Module Products.Sessions.SessionDataManager, line 181, in
>> _getSessionDataObject
>> * Module Products.Transience.Transience, line 840, in
>> new_or_existing
>> * Module Products.Transience.Transience, line 487, in get
>> * Module Products.Transience.Transience, line 293, in _move_item
>> * Module ZODB.Connection, line 599, in setstate
>> * Module ZODB.Connection, line 628, in _is_invalidated
>>
>> ReadConflictError: database read conflict error (oid 0x0f81, class
>> BTrees.IOBTree.IOBucket)
>>
>> --
>>
>> TYPE 2 ERROR
>>
>> Site Error
>>
>> An error was encountered while publishing this resource.
>>
>> ZODB.POSException.ReadConflictError
>> Sorry, a site error occurred.
>>
>> Traceback (innermost last):
>>
>> * Module ZPublisher.Publish, line 175, in publish_module_standard
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 149, in publish
>> * Module Products.PlacelessTranslationService.PatchStringIO, line
>> 51, in new_publish
>> * Module ZPublisher.Publish, line 139, in publish
>> * Module Zope.App.startup, line 163, in zpublisher_exception_hook
>> * Module ZPublisher.Publish, line 101, in publish
>> * Module ZPublisher.mapply, line 88, in mapply
>> * Module ZPublisher.Publish, line 39, in call_object
>> * Module Products.CMFFormController.ControllerPageTemplate, line
>> 80, in __call__
>> * Module Products.CMFFormController.BaseControllerPageTemplate,
>> line 39, in _call
>> * Module Products.CMFFormController.ControllerBase, line 243, in
>> getNext
>> * Module Products.CMFFormController.Actions.TraverseTo, line 36,
>> in
>> __call__
>> * Module ZPublisher.mapply, line 88, in mapply
>> * Module ZPublisher.Publish, line 39, in call_object
>> * Module Products.CMFFormController.FSControllerPythonScript,
>> line
>> 102, in __call__
>> * Module Products.CMFFormController.FormController, line 354, in
>> validate
>> * Module ZPublisher.BaseRequest, line 156, in items
>> * Module ZPublisher.HTTPRequest, line 1178, in get
>> * Module Products.Sessions.SessionDataManager, line 94, in
>> getSessionData
>> * Module Products.Sessions.SessionDataManager, line 181, in
>> _getSessionDataObject
>> * Module Products.Transience.Transience, line 840, in
>> new_or_existing
>> * Module Products.Transience.Transience, line 487, in get
>> * Module Products.Transience.Transience, line 276, in _move_item
>> * Module Products.Transience.Transience, line 939, in _housekeep
>> * Module Products.Transience.Transience, line 566, in _finalize
>> * Module Products.Transience.Transience, line 600, in
>> _do_finalize_work
>> * Module ZODB.Connection, line 599, in setstate
>> * Module ZODB.Connection, line 628, in _is_invalidated
>>
>> ReadConflictError: database read conflict error (oid 0x08, class
>> Products.Transience.Transience.Length2)
>>
>> --
>>
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>
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