[Zope-Annce] ZEO 1.0b4 released

[Jeremy Hylton]

At long last, the fourth and final beta release of ZEO 1.0 is
available at http://www.zope.org/Products/ZEO.  I expect to release
1.0 final next week.

Zope Enterprise Objects (ZEO) provides the ability for multiple
processes to use a single Zope Object Database.  ZEO turns the Zope
object system into a distributed architecture, allowing multiple
processors, machines, and networks to act as one website.

The 1.0b4 release fixes all the major bugs reported since 1.0b3.  The
list of bug fixes is:

    - Improved robustness of ZEO under load.  Many non-fatal socket
      errors are caught and handled now.  Also fix NameError bug that
      could cause ZEO to fail on Windows.

    - Reduced the likelihood that a thread.error exception ("release
      unlocked lock") will be raised if a client disconnects from a
      storage unexpectedly.  

    - Fixed a bug in undo handling that caused connections to be reset
      and prevented undos from propagating to all clients.

    - Fixed a bug that prevented a client from reconnecting to a
      server if the server restarted.

    - Fixed start.py so that it prints a message on the console when
      it fails in addition to using zLOG.

    - Fleshed out installation instructions and version dependencies.

    - Fixed bug in non-transactional undo that caused undo to fail and
      clients to restart. 

Jeremy