On Dec 21, 2005, at 12:40 PM, Dennis Allison wrote:
Chris W,
The issue here has had to do with session variables and their
iteraction
with the persistence mechanism and conflicts and multiple threads
for the
same session. Chris McDonough has pointed out that session
variables can
cause writes and write conflicts even if the only Zope level access
is a
read. I thought MVCC works out of the box for Zope 2.8.4 which
uses ZODB
2.3.4. Am I wrong?
It does. But MVCC does not prevent write conflicts. Only read
conflicts.
The real surprise was that you can get a write conflict from a pair of
session variable reads!
That is surprising, no doubt. ;-)
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