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ZODB v3.6.2 Release Notes

  • 🚀 Release date: 15-July-2006

    DemoStorage

    🚀 Following is combined news from internal releases (to support ongoing 🚀 Zope2 / Zope3 development). These are the dates of the internal releases:

    • 3.6.1 27-Mar-2006
    • 3.6.0 05-Jan-2006
    • 3.6b6 01-Jan-2006
    • 3.6b5 18-Dec-2005
    • 3.6b4 04-Dec-2005
    • 3.6b3 06-Nov-2005
    • 3.6b2 25-Oct-2005
    • 3.6b1 24-Oct-2005
    • 3.6a4 07-Oct-2005
    • 3.6a3 07-Sep-2005
    • 3.6a2 06-Sep-2005
    • 3.6a1 04-Sep-2005

    🗄 Removal of Features Deprecated in ZODB 3.4

    🗄 (3.6b2) ZODB 3.6 no longer contains features officially deprecated in the 🚀 ZODB 3.4 release. These include:

    • get_transaction(). Use transaction.get() instead. transaction.commit() is a shortcut spelling of transaction.get().commit(), and transaction.abort() of transaction.get().abort(). Note that importing ZODB no longer installs get_transaction as a name in Python's __builtin__ module either.

    • The begin() method of Transaction objects. Use the begin() method of a transaction manager instead. transaction.begin() is a shortcut spelling to call the default transaction manager's begin() method.

    • The dt argument to Connection.cacheMinimize().

    • The Connection.cacheFullSweep() method. Use cacheMinimize() instead.

    • The Connection.getTransaction() method. Pass a transaction manager to DB.open() instead.

    • The Connection.getLocalTransaction() method. Pass a transaction manager to DB.open() instead.

    • The cache_deactivate_after and version_cache_deactivate_after arguments to the DB constructor.

    • The temporary, force, and waitflag arguments to DB.open(). DB.open() no longer blocks (there's no longer a fixed limit on the number of open connections).

    • The transaction and txn_mgrarguments to DB.open(). Use the transaction_manager argument instead.

    • The getCacheDeactivateAfter, setCacheDeactivateAfter, getVersionCacheDeactivateAfter and setVersionCacheDeactivateAfter methods of DB.

    Persistent

    • ⚠ (3.6.1) Suppressed warnings about signedness of characters when compiling under GCC 4.0.x. See http://www.zope.org/Collectors/Zope/2027.

    • (3.6a4) ZODB 3.6 introduces a change to the basic behavior of Persistent objects in a particular end case. Before ZODB 3.6, setting obj._p_changed to a true value when obj was a ghost was ignored: obj remained a ghost, and getting obj._p_changed continued to return None. Starting with ZODB 3.6, obj is activated instead (unghostified), and its state is changed from the ghost state to the changed state. The new behavior is less surprising and more robust.

    • (3.6b5) The documentation for _p_oid now specifies the concrete type of oids (in short, an oid is either None or a non-empty string).

    Commit hooks

    • (3.6a1) The beforeCommitHook() method has been replaced by the new addBeforeCommitHook() method, with a more-robust signature. beforeCommitHook() is now deprecated, and will be removed in ZODB 3.8. Thanks to Julien Anguenot for contributing code and tests.

    Connection management

    • (3.6b6) When more than pool_size connections have been closed, DB forgets the excess (over pool_size) connections closed first. Python's cyclic garbage collection can take "a long time" to reclaim them (and may in fact never reclaim them if application code keeps strong references to them), but such forgotten connections can never be opened again, so their caches are now cleared at the time DB forgets them. Most applications won't notice a difference, but applications that open many connections, and/or store many large objects in connection caches, and/or store limited resources (such as RDB connections) in connection caches may benefit.

    ZEO

    • (3.6a4) Collector 1900. In some cases of pickle exceptions raised by low-level ZEO communication code, callers of marshal.encode() could attempt to catch an exception that didn't actually exist, leading to an erroneous AttributeError exception. Thanks to Tres Seaver for the diagnosis.

    BaseStorage

    • 👻 (3.6a4) Nothing done by tpc_abort() should raise an exception. However, if something does (an error case), BaseStorage.tpc_abort() left the commit lock in the acquired state, causing any later attempt to commit changes hang.

    Multidatabase

    • (3.6b1) The database_name for a database in a multidatabase collection can now be specified in a config file's <zodb> section, as the value of the optional new database_name key. The .databases attribute cannot be specified in a config file, but can be passed as the optional new databases argument to the open() method of a ZConfig factory for type ZODBDatabase. For backward compatibility, Zope 2.9 continues to allow using the name in its <zodb_db name> config section as the database name (note that <zodb_db> is defined by Zope, not by ZODB -- it's a Zope-specific extension of ZODB's <zodb> section).

    PersistentMapping

    • (3.6.1) PersistentMapping was inadvertently pickling volatile attributes (http://www.zope.org/Collectors/Zope/2052).

    • (3.6b4) PersistentMapping makes changes by a pop() method call persistent now (http://www.zope.org/Collectors/Zope/2036).

    • (3.6a1) The PersistentMapping class has an __iter__() method now, so that objects of this type work well with Python's iteration protocol. For example, if x is a PersistentMapping (or Python dictionary, or BTree, or PersistentDict, ...), then for key in x: iterates over the keys of x, list(x) creates a list containing x's keys, iter(x) creates an iterator for x's keys, and so on.

    Tools

    • 🌲 (3.6b5) The changeover from zLOG to the logging module means that some tools need to perform minimal logging configuration themselves. Changed the zeoup script to do so and thus enable it to emit error messages.

    BTrees

    • ⚠ (3.6.1) Suppressed warnings about signedness of characters when compiling under GCC 4.0.x. See http://www.zope.org/Collectors/Zope/2027.

    • 0️⃣ (3.6a1) BTrees and Buckets now implement the setdefault() and pop() methods. These are exactly like Python's dictionary methods of the same names, except that setdefault() requires both arguments (and Python is likely to change to require both arguments too -- defaulting the default argument to None has no viable use cases). Thanks to Ruslan Spivak for contributing code, tests, and documentation.

    • (3.6a1) Collector 1873. It wasn't possible to construct a BTree or Bucket from, or apply their update() methods to, a PersistentMapping or PersistentDict. This works now.

    ZopeUndo

    • 🛠 (3.6a4) Collector 1810. A previous bugfix (#1726) broke listing undoable transactions for users defined in a non-root acl_users folder. Zope logs a acl_users path together with a username (separated by a space) and this previous fix failed to take this into account.

    Connection

    • (3.6b5) An optimization for loading non-current data (MVCC) was inadvertently disabled in _setstate(); this has been repaired.

    📚 Documentation

    • ✅ (3.6b3) Thanks to Stephan Richter for converting many of the doctest files to ReST format. These are now chapters in the Zope 3 apidoc too.

    • (3.6b4) Several misspellings of "occurred" were repaired.

    Development

    • (3.6a1) The source code for the old ExtensionClass-based Persistence package moved, from ZODB to the Zope 2.9 development tree. ZODB 3.5 makes no use of Persistence, and, indeed, the Persistence package could not be compiled from a ZODB release, since some of the C header files needed appear only in Zope.

    • (3.6a3) Re-added the zeoctl module, for the same reasons mkzeoinst was re-added (see below).

    • (3.6a2) The mkzeoinst module was re-added to ZEO, because Zope3 has a script that expects to import it from there. ZODB's mkzeoinst script was rewritten to invoke the mkzeoinst module.

    transact

    • (3.6b4) Collector 1959: The undocumented transact module no longer worked. It remains undocumented and untested, but thanks to Janko Hauser it's possible that it works again ;-).