[ZODB-Dev] Potential BTrees splitting bug

[Dieter Maurer]

On one family of our servers, the test
"ZEO.tests.testConnection.checkConcurrentUpdates2Storages"
fails non-deterministically but with high probability.

This is Dual 2GHz AMD, Debian Linux, Python 2.1.3, current Zope 2_6branch
from CVS with my "No more ReadConflicts" patch installed.

I looked at about 40 failures. All followed the same pattern:

  It was always the last key of a 17 element bucket that were
  unordered.

  For me, it looked as if under some circumstances the last
  element of a splitting bucket were forgotten to be moved
  into the new bucket.


The test passed always on Mono 1.5 Ghz AMD, SuSE Linux and otherwise
identical parameters.



Dieter