[Zope] [Warning] "No more ReadConflicts" patch can cause inconsistencies

[Dieter Maurer]

Dear Zope community,

I have to admit that my "No more ReadConflicts" patch can cause
ZODB inconsistencies. Probability is low but not zero.
Details can be found on <mailto:zodb-dev at zope.org>.

This fault was revealed by one of the ZODB 3.1.2 InvalidationTests
which can fail on high speed servers.

The problem can not be fixed for ZODB 3.1.
I will work on a patch for ZODB 3.2 which avoids this problem
(by implementing part of Jeremy's MVCC proposal).


Dieter