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Commit 5159a7d6 authored by Jim Fulton's avatar Jim Fulton
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Updated change logs in preparation for 3.10.0 release: 

- Moved 3.9 changes to HISTORY.txt.

- Consolidated 3.10 pre-release entries.

- Removed 3.10 (bug fix) entries for fixes that were in 3.9, so the
  3.10 changes are from 3.9.
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HISTORY.txt
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3.9.7 (2010-09-28)
==================
Bugs Fixed
----------
- Changes in way that garbage collection treats dictionaries in Python
2.7 broke the object/connection cache implementation.
(https://bugs.launchpad.net/zodb/+bug/641481)
Python 2.7 wasn't officially supported, but we were releasing
binaries for it, so ...
- Logrotation/repoening via a SIGUSR2 signal wasn't implemented.
(https://bugs.launchpad.net/zodb/+bug/143600)
- When using multi-databases, cache-management operations on a
connection, cacheMinimize and cacheGC, weren't applied to
subconnections.
3.9.6 (2010-09-21)
==================
Bugs Fixed
----------
- Updating blobs in save points could cause spurious "invalidations
out of order" errors. https://bugs.launchpad.net/zodb/+bug/509801
(Thanks to Christian Zagrodnick for chasing this down.)
- If a ZEO client process was restarted while invalidating a ZEO cache
entry, the cache could be left in a stage when there is data marked
current that should be invalidated, leading to persistent conflict
errors.
- Corrupted or invalid cache files prevented ZEO clients from
starting. Now, bad cache files are moved aside.
- Invalidations of object records in ZEO caches, where the
invalidation transaction ids matched the cached transaction ids
should have been ignored.
- Shutting down a process while committing a transaction or processing
invalidations from the server could cause ZEO persistent client
caches to have invalid data. This, in turn caused stale data to
remain in the cache until it was updated.
- Conflict errors didn't invalidate ZEO cache entries.
- When objects were added in savepoints and either the savepoint was
rolled back (https://bugs.launchpad.net/zodb/+bug/143560) or the
transaction was aborted
(https://mail.zope.org/pipermail/zodb-dev/2010-June/013488.html)
The objects' _p_oid and _p_jar variables weren't cleared, leading to
surprizing errors.
- Objects added in transactions that were later aborted could have
_p_changed still set (https://bugs.launchpad.net/zodb/+bug/615758).
- ZEO extension methods failed when a client reconnected to a
storage. (https://bugs.launchpad.net/zodb/+bug/143344)
- On Mac OS X, clients that connected and disconnected quickly could
cause a ZEO server to stop accepting connections, due to a failure
to catch errors in the initial part of the connection process.
The failure to properly handle exceptions while accepting
connections is potentially problematic on other platforms.
Fixes: https://bugs.launchpad.net/zodb/+bug/135108
- Passing keys or values outside the range of 32-bit ints on 64-bit
platforms led to undetected overflow errors. Now these cases cause
Type errors to be raised.
https://bugs.launchpad.net/zodb/+bug/143237
- BTree sets and tree sets didn't correctly check values passed to
update or to constructors, causing Python to exit under certain
circumstances.
- The verbose mode of the fstest was broken.
(https://bugs.launchpad.net/zodb/+bug/475996)
3.9.5 (2010-04-23)
==================
Bugs Fixed
----------
- Fixed bug in cPickleCache's byte size estimation logic.
(https://bugs.launchpad.net/zodb/+bug/533015)
- Fixed a serious bug that caused cache failures when run
with Python optimization turned on.
https://bugs.launchpad.net/zodb/+bug/544305
- Fixed a bug that caused savepoint rollback to not properly
set object state when objects implemented _p_invalidate methods
that reloaded ther state (unghostifiable objects).
https://bugs.launchpad.net/zodb/+bug/428039
- cross-database wekrefs weren't handled correctly.
https://bugs.launchpad.net/zodb/+bug/435547
- The mkzeoinst script was fixed to tell people to
install and use the mkzeoinstance script. :)
3.9.4 (2009-12-14)
==================
Bugs Fixed
----------
- A ZEO threading bug could cause transactions to read inconsistent
data. (This sometimes caused an AssertionError in
Connection._setstate_noncurrent.)
- DemoStorage.loadBefore sometimes returned invalid data which
would trigger AssertionErrors in ZODB.Connection.
- History support was broken when using stprages that work with ZODB
3.8 and 3.9.
- zope.testing was an unnecessary non-testing dependency.
- Internal ZEO errors were logged at the INFO level, rather
than at the error level.
- The FileStorage backup and restore script, repozo, gave a
deprecation warning under Python 2.6.
- C Header files weren't installed correctly.
- The undo implementation was incorrect in ways that could cause
subtle missbehaviors.
3.9.3 (2009-10-23)
==================
Bugs Fixed
----------
- 2 BTree bugs, introduced by a bug fix in 3.9.0c2, sometimes caused
deletion of keys to be improperly handled, resulting in data being
available via iteraation but not item access.
3.9.2 (2009-10-13)
==================
Bugs Fixed
----------
- ZEO manages a separate thread for client network IO. It created
this thread on import, which caused problems for applications that
implemented daemon behavior by forking. Now, the client thread
isn't created until needed.
- File-storage pack clean-up tasks that can take a long time
unnecessarily blocked other activity.
- In certain rare situations, ZEO client connections would hang during
the initial connection setup.
3.9.1 (2009-10-01)
==================
Bugs Fixed
----------
- Conflict errors committing blobs caused ZEO servers to stop committing
transactions.
3.9.0 (2009-09-08)
==================
New Features (in more or less reverse chronological order)
----------------------------------------------------------
- The Database class now has an ``xrefs`` keyword argument and a
corresponding allow-implicit-cross-references configuration option.
which default to true. When set to false, cross-database references
are disallowed.
- Added support for RelStorage.
- As a convenience, the connection root method for returning the root
object can now *also* be used as an object with attributes mapped to
the root-object keys.
- Databases have a new method, ``transaction``, that can be used with the
Python (2.5 and later) ``with`` statement::
db = ZODB.DB(...)
with db.transaction() as conn:
# ... do stuff with conn
This uses a private transaction manager for the connection.
If control exits the block without an error, the transaction is
committed, otherwise, it is aborted.
- Convenience functions ZODB.connection and ZEO.connection provide a
convenient way to open a connection to a database. They open a
database and return a connection to it. When the connection is
closed, the database is closed as well.
- The ZODB.config databaseFrom... methods now support
multi-databases. If multiple zodb sections are used to define
multiple databases, the databases are connected in a multi-database
arrangement and the first of the defined databases is returned.
- The zeopack script has gotten a number of improvements:
- Simplified command-line interface. (The old interface is still
supported, except that support for ZEO version 1 servers has been
dropped.)
- Multiple storages can be packed in sequence.
- This simplifies pack scheduling on servers serving multiple
databases.
- All storages are packed to the same time.
- You can now specify a time of day to pack to.
- The script will now time out if it can't connect to s storage in
60 seconds.
- The connection now estimates the object size based on its pickle size
and informs the cache about size changes.
The database got additional configurations options (`cache-size-bytes`
and `historical-cache-size-bytes`) to limit the
cache size based on the estimated total size of cached objects.
The default values are 0 which has the interpretation "do not limit
based on the total estimated size".
There are corresponding methods to read and set the new configuration
parameters.
- Connections now have a public ``opened`` attribute that is true when
the connection is open, and false otherwise. When true, it is the
seconds since the epoch (time.time()) when the connection was
opened. This is a renaming of the previous ``_opened`` private
variable.
- FileStorage now supports blobs directly.
- You can now control whether FileStorages keep .old files when packing.
- POSKeyErrors are no longer logged by ZEO servers, because they are
really client errors.
- A new storage interface, IExternalGC, to support external garbage
collection, http://wiki.zope.org/ZODB/ExternalGC, has been defined
and implemented for FileStorage and ClientStorage.
- As a small convenience (mainly for tests), you can now specify
initial data as a string argument to the Blob constructor.
- ZEO Servers now provide an option, invalidation-age, that allows
quick verification of ZEO clients have been disconnected for less
than a given time even if the number of transactions the client
hasn't seen exceeds the invalidation queue size. This is only
recommended if the storage being served supports efficient iteration
from a point near the end of the transaction history.
- The FileStorage iterator now handles large files better. When
iterating from a starting transaction near the end of the file, the
iterator will scan backward from the end of the file to find the
starting point. This enhancement makes it practical to take
advantage of the new storage server invalidation-age option.
- Previously, database connections were managed as a stack. This
tended to cause the same connection(s) to be used over and over.
For example, the most used connection would typically be the only
connection used. In some rare situations, extra connections could
be opened and end up on the top of the stack, causing extreme memory
wastage. Now, when connections are placed on the stack, they sink
below existing connections that have more active objects.
- There is a new pool-timeout database configuration option to specify that
connections unused after the given time interval should be garbage
collection. This will provide a means of dealing with extra
connections that are created in rare circumstances and that would
consume an unreasonable amount of memory.
- The Blob open method now supports a new mode, 'c', to open committed
data for reading as an ordinary file, rather than as a blob file.
The ordinary file may be used outside the current transaction and
even after the blob's database connection has been closed.
- ClientStorage now provides blob cache management. When using
non-shared blob directories, you can set a target cache size and the
cache will periodically be reduced try to keep it below the target size.
The client blob directory layout has changed. If you have existing
non-shared blob directories, you will have to remove them.
- ZODB 3.9 ZEO clients can connect to ZODB 3.8 servers. ZODB ZEO clients
from ZODB 3.2 on can connect to ZODB 3.9 servers.
- When a ZEO cache is stale and would need verification, a
ZEO.interfaces.StaleCache event is published (to zope.event).
Applications may handle this event and take action such as exiting
the application without verifying the cache or starting cold.
- There's a new convenience function, ZEO.DB, for creating databases
using ZEO Client Storages. Just call ZEO.DB with the same arguments
you would otherwise pass to ZEO.ClientStorage.ClientStorage::
import ZEO
db = ZEO.DB(('some_host', 8200))
- Object saves are a little faster
- When configuring storages in a storage server, the storage name now
defaults to "1". In the overwhelmingly common case that a single
storage, the name can now be omitted.
- FileStorage now provides optional garbage collection. A 'gc'
keyword option can be passed to the pack method. A false value
prevents garbage collection.
- The FileStorage constructor now provides a boolean pack_gc option,
which defaults to True, to control whether garbage collection is
performed when packing by default. This can be overridden with the
gc option to the pack method.
The ZConfig configuration for FileStorage now includes a pack-gc
option, corresponding to the pack_gc constructor argument.
- The FileStorage constructor now has a packer keyword argument that
allows an alternative packer to be supplied.
The ZConfig configuration for FileStorage now includes a packer
option, corresponding to the packer constructor argument.
- MappingStorage now supports multi-version concurrency control and
iteration and provides a better storage implementation example.
- DemoStorage has a number of new features:
- The ability to use a separate storage, such as a file storage to
store changes
- Blob support
- Multi-version concurrency control and iteration
- Explicit support for demo-storage stacking via push and pop methods.
- Wen calling ZODB.DB to create a database, you can now pass a file
name, rather than a storage to use a file storage.
- Added support for copying and recovery of blob storages:
- Added a helper function, ZODB.blob.is_blob_record for testing whether
a data record is for a blob. This can be used when iterating over a
storage to detect blob records so that blob data can be copied.
In the future, we may want to build this into a blob-aware
iteration interface, so that records get blob file attributes
automatically.
- Added the IBlobStorageRestoreable interfaces for blob storages
that support recovery via a restoreBlob method.
- Updated ZODB.blob.BlobStorage to implement
IBlobStorageRestoreable and to have a copyTransactionsFrom method
that also copies blob data.
- New `ClientStorage` configuration option `drop_cache_rather_verify`.
If this option is true then the ZEO client cache is dropped instead of
the long (unoptimized) verification. For large caches, setting this
option can avoid effective down times in the order of hours when
the connection to the ZEO server was interrupted for a longer time.
- Cleaned-up the storage iteration API and provided an iterator implementation
for ZEO.
- Versions are no-longer supported.
- Document conflict resolution (see ZODB/ConflictResolution.txt).
- Support multi-database references in conflict resolution.
- Make it possible to examine oid and (in some situations) database
name of persistent object references during conflict resolution.
- Moved the 'transaction' module out of ZODB.
ZODB depends upon this module, but it must be installed separately.
- ZODB installation now requires setuptools.
- Added `offset` information to output of `fstail`
script. Added test harness for this script.
- Added support for read-only, historical connections based
on datetimes or serials (TIDs). See
src/ZODB/historical_connections.txt.
- Removed the ThreadedAsync module.
- Now depend on zc.lockfile
Bugs Fixed
----------
- CVE-2009-2701: Fixed a vulnerability in ZEO storage servers when
blobs are available. Someone with write access to a ZEO server
configured to support blobs could read any file on the system
readable by the server process and remove any file removable by the
server process.
- BTrees (and TreeSets) kept references to internal keys.
https://bugs.launchpad.net/zope3/+bug/294788
- BTree Sets and TreeSets don't support the standard set add method.
(Now either add or the original insert method can be used to add an
object to a BTree-based set.)
- The runzeo script didn't work without a configuration file.
(https://bugs.launchpad.net/zodb/+bug/410571)
- Officially deprecated PersistentDict
(https://bugs.launchpad.net/zodb/+bug/400775)
- Calling __setstate__ on a persistent object could under certain
uncommon cause the process to crash.
(https://bugs.launchpad.net/zodb/+bug/262158)
- When committing transactions involving blobs to ClientStorages with
non-shared blob directories, a failure could occur in tpc_finish if
there was insufficient disk space to copy the blob file or if the
file wasn't available. https://bugs.launchpad.net/zodb/+bug/224169
- Savepoint blob data wasn't properly isolated. If multiple
simultaneous savepoints in separate transactions modified the same
blob, data from one savepoint would overwrite data for another.
- Savepoint blob data wasn't cleaned up after a transaction abort.
https://bugs.launchpad.net/zodb/+bug/323067
- Opening a blob with modes 'r+' or 'a' would fail when the blob had no
committed changes.
- PersistentList's sort method did not allow passing of keyword parameters.
Changed its sort parameter list to match that of its (Python 2.4+)
UserList base class.
- Certain ZEO server errors could cause a client to get into a state
where it couldn't commit transactions.
https://bugs.launchpad.net/zodb/+bug/374737
- Fixed vulnerabilities in the ZEO network protocol that allow:
- CVE-2009-0668 Arbitrary Python code execution in ZODB ZEO storage servers
- CVE-2009-0669 Authentication bypass in ZODB ZEO storage servers
The vulnerabilities only apply if you are using ZEO to share a
database among multiple applications or application instances and if
untrusted clients are able to connect to your ZEO servers.
- Fixed the setup test command. It previously depended on private
functions in zope.testing.testrunner that don't exist any more.
- ZEO client threads were unnamed, making it hard to debug thread
management.
- ZEO protocol 2 support was broken. This caused very old clients to
be unable to use new servers.
- zeopack was less flexible than it was before. -h should default to
local host.
- The "lawn" layout was being selected by default if the root of
the blob directory happened to contain a hidden file or directory
such as ".svn". Now hidden files and directories are ignored
when choosing the default layout.
- BlobStorage was not compatible with MVCC storages because the
wrappers were being removed by each database connection. Fixed.
- Saving indexes for large file storages failed (with the error:
RuntimeError: maximum recursion depth exceeded). This can cause a
FileStorage to fail to start because it gets an error trying to save
its index.
- Sizes of new objects weren't added to the object cache size
estimation, causing the object-cache size limiting feature to let
the cache grow too large when many objects were added.
- Deleted records weren't removed when packing file storages.
- Fixed analyze.py and added test.
- fixed Python 2.6 compatibility issue with ZEO/zeoserverlog.py
- using hashlib.sha1 if available in order to avoid DeprecationWarning
under Python 2.6
- made runzeo -h work
- The monitor server didn't correctly report the actual number of
clients.
- Packing could return spurious errors due to errors notifying
disconnected clients of new database size statistics.
- Undo sometimes failed for FileStorages configured to support blobs.
- Starting ClientStorages sometimes failed with non-new but empty
cache files.
- The history method on ZEO clients failed.
- Fix for bug #251037: Make packing of blob storages non-blocking.
- Fix for bug #220856: Completed implementation of ZEO authentication.
- Fix for bug #184057: Make initialisation of small ZEO client file cache
sizes not fail.
- Fix for bug #184054: MappingStorage used to raise a KeyError during `load`
instead of a POSKeyError.
- Fixed bug in Connection.TmpStore: load() would not defer to the backend
storage for loading blobs.
- Fix for bug #181712: Make ClientStorage update `lastTransaction` directly
after connecting to a server, even when no cache verification is necessary.
- Fixed bug in blob filesystem helper: the `isSecure` check was inverted.
- Fixed bug in transaction buffer: a tuple was unpacked incorrectly in
`clear`.
- Bugfix the situation in which comparing persistent objects (for
instance, as members in BTree set or keys of BTree) might cause data
inconsistency during conflict resolution.
- Fixed bug 153316: persistent and BTrees were using `int`
for memory sizes which caused errors on x86_64 Intel Xeon machines
(using 64-bit Linux).
- Fixed small bug that the Connection.isReadOnly method didn't
work after a savepoint.
- Bug #98275: Made ZEO cache more tolerant when invalidating current
versions of objects.
- Fixed a serious bug that could cause client I/O to stop
(hang). This was accompanied by a critical log message along the
lines of: "RuntimeError: dictionary changed size during iteration".
- Fixed bug #127182: Blobs were subclassable which was not desired.
- Fixed bug #126007: tpc_abort had untested code path that was
broken.
- Fixed bug #129921: getSize() function in BlobStorage could not
deal with garbage files
- Fixed bug in which MVCC would not work for blobs.
- Fixed bug in ClientCache that occurred with objects larger than the total
cache size.
- When an error occured attempting to lock a file and logging of said error was
enabled.
- FileStorages previously saved indexes after a certain
number of writes. This was done during the last phase of two-phase
commit, which made this critical phase more subject to errors than
it should have been. Also, for large databases, saves were done so
infrequently as to be useless. The feature was removed to reduce
the chance for errors during the last phase of two-phase commit.
- File storages previously kept an internal object id to
transaction id mapping as an optimization. This mapping caused
excessive memory usage and failures during the last phase of
two-phase commit. This optimization has been removed.
- Refactored handling of invalidations on ZEO clients to fix
a possible ordering problem for invalidation messages.
- On many systems, it was impossible to create more than 32K
blobs. Added a new blob-directory layout to work around this
limitation.
- Fixed bug that could lead to memory errors due to the use
of a Python dictionary for a mapping that can grow large.
- Fixed bug #251037: Made packing of blob storages non-blocking.
- Fixed a bug that could cause InvalidObjectReference errors
for objects that were explicitly added to a database if the object
was modified after a savepoint that added the object.
- Fixed several bugs that caused ZEO cache corruption when connecting
to servers. These bugs affected both persistent and non-persistent caches.
- Improved the the ZEO client shutdown support to try to
avoid spurious errors on exit, especially for scripts, such as zeopack.
- Packing failed for databases containing cross-database references.
- Cross-database references to databases with empty names
weren't constructed properly.
- The zeo client cache used an excessive amount of memory, causing applications
with large caches to exhaust available memory.
- Fixed a number of bugs in the handling of persistent ZEO caches:
- Cache records are written in several steps. If a process exits
after writing begins and before it is finishes, the cache will be
corrupt on restart. The way records are written was changed to
make cache record updates atomic.
- There was no lock file to prevent opening a cache multiple times
at once, which would lead to corruption. Persistent caches now
use lock files, in the same way that file storages do.
- A bug in the cache-opening logic led to cache failure in the
unlikely event that a cache has no free blocks.
- When using ZEO Client Storages, Errors occured when trying to store
objects too big to fit in the ZEO cache file.
- Fixed bug in blob filesystem helper: the `isSecure` check was inverted.
- Fixed bug in transaction buffer: a tuple was unpacked incorrectly in
`clear`.
- Fixed bug in Connection.TmpStore: load() would not defer to the
back-end storage for loading blobs.
- Fixed bug #190884: Wrong reference to `POSKeyError` caused NameError.
- Completed implementation of ZEO authentication. This fixes issue 220856.
What's new in ZODB 3.8.0
========================
......
src/CHANGES.txt
View file @ 5159a7d6
......@@ -2,209 +2,44 @@
Change History
================
3.10.0b8 (2010-09-30)
=====================
3.10.0 (2010-10-08)
===================
Bugs fixed
----------
- On some systems, using an empty string in a server address of a ZEO
client led to a socket error. Now, ZEO clients treat '' as an alias
for 'localhost'.
- When a pool timeout was specified for a database and old connections
were removed due to timing out, an error occured due to a bug in the
connection cleanup logic.
- When mulri-database connections were no longer used and cleaned up,
their subconnections weren't cleaned up properly.
- Changes to suppprt IPv6 broke a fix for a problem on Mac OS X that
could cause a server to stop accepting connections.
3.10.0b7 (2010-09-28)
=====================
Bugs fixed
----------
- ZEO didn't work with IPv6 addrsses.
Added IPv6 support contributed by Martin v. Löwis.
- Changes in way that garbage collection treats dictionaries in Python
2.7 broke the object/connection cache implementation.
(https://bugs.launchpad.net/zodb/+bug/641481)
- A file storage bug could cause ZEO clients to have incorrect
information about current object revisions after reconnecting to a
database server.
- Updated the 'repozo --kill-old-on-full' option to remove any '.index'
files corresponding to backups being removed.
- When objects were added in savepoints and either the savepoint was
rolled back (https://bugs.launchpad.net/zodb/+bug/143560) or the
transaction was aborted
(https://mail.zope.org/pipermail/zodb-dev/2010-June/013488.html)
The objects' _p_oid and _p_jar variables weren't cleared, leading to
surprizing errors.
- ZEO extension methods failed when a client reconnected to a
storage. (https://bugs.launchpad.net/zodb/+bug/143344)
- Objects added in transactions that were later aborted could have
_p_changed still set (https://bugs.launchpad.net/zodb/+bug/615758).
- Clarified the return Value for lastTransaction in the case when
there aren't any transactions. Now a string of 8 nulls (aka "z64")
is specified.
- When using multi-databases, cache-management operations on a
connection, cacheMinimize and cacheGC, weren't applied to
subconnections.
- Setting _p_changed on a blob wo actually writing anything caused an
error. (https://bugs.launchpad.net/zodb/+bug/440234)
- The verbose mode of the fstest was broken.
(https://bugs.launchpad.net/zodb/+bug/475996)
- Object ids created in a savepoint that is rolled back wren't being
reused. (https://bugs.launchpad.net/zodb/+bug/588389)
- Logrotation/repoening via a SIGUSR2 signal wasn't implemented.
(https://bugs.launchpad.net/zodb/+bug/143600)
(Untested on windows.)
3.10.0b6 (2010-09-08)
=====================
Bugs fixed
----------
- Process exits or database closes could cause ZEO caches to have
incorrect data due to a problem in the way invalidations were processed.
- Database connections didn't invalidate cache entries when conflict
errors were raised in response to checkCurrentSerialInTransaction
errors. Normally, this shouldn't be a problem, since there should be
pending invalidations for these oids which will cause the object to
be invalidated. There have been issues with ZEO persistent cache
management that have caused out of date data to remain in the cache.
(It's possible that the last of these were addressed in the
3.10.0b5.) Invalidating read data when there is a conflict error
provides some extra insurance.
- The interface, ZODB.interfaces.IStorage was incorrect. The store
method should never return a sequence of oid and serial pairs.
3.10.0b5 (2010-09-02)
=====================
Bugs fixed
----------
- Added a new API that allows applications to make sure that current
data are read. For example, with::
self._p_jar.readCurrent(ob)
A conflict error will be raised if the version of ob read by the
transaction isn't current when the transaction is committed.
Normally, ZODB only assures that objects read are consistent, but not
necessarily up to date. Checking whether an object is up to date is
important when information read from one object is used to update
another.
BTrees are an important case of reading one object to update
another. Internal nodes are read to decide which leave notes are
updated when a BTree is updated. BTrees now use this new API to
make sure that internal nodes are up to date on updates.
- Shutting down a process while committing a transaction could cause
ZEO client caches to have invalid data. This, in turn caused stale
data to remain in the cache until it was updated.
- Removed untested unsupported dbmstorage fossile.
3.10.0b4 (2010-07-19)
=====================
Bugs fixed
----------
- When an integer too large to fit in a 32-bit integer was provided as
a 32-bit-integer BTree key or value on 64-bit machines, an
OverflowError was raised. Now a TypeError is raised.
3.10.0b3 (2010-07-15)
=====================
Bugs fixed
----------
- A change in 3.10.0b2:
"DemoStorages didn't close their changes databases when they were
created temporarily (not passed to the constructor)."
Introduced a backward-compatibility problem for some applications.
This change was reverted.
3.10.0b2 (2010-07-13)
=====================
Bugs fixed
----------
- Updating blobs in save points could cause spurious "invalidations
out of order" errors. https://bugs.launchpad.net/zodb/+bug/509801
(Thanks to Christian Zagrodnick for chasing this down.)
- When a demo storage push method was used to create a new demo
storage and the new storage was closed, the original was
(incorrectly) closed.
- DemoStorages didn't close their changes databases when they were
created temporarily (not passed to the constructor).
- Passing keys or values outside the range of 32-bit ints on 64-bit
platforms led to undetected overflow errors. Now these cases cause
Overflow errors to be raised.
https://bugs.launchpad.net/zodb/+bug/143237
New Features
------------
- There were numerous bugs in the ZEO cache tracing and analysys code.
Cache simulation, while not perfect, seems to be much more accurate
now than it was before.
- There are a number of performance enhancements for ZEO storage
servers.
The ZEO cache trace statistics and simulation scripts have been
given more descriptive names and moved to the ZEO scripts package.
- FileStorage indexes use a new format. They are saved and loaded much
faster and take less space. Old indexes can still be read, but new
indexes won't be readable by older versions of ZODB.
- If a ZEO client process was restarted while invalidating a ZEO cache
entry, the cache could be left in a stage when there is data marked
current that should be invalidated, leading to persistent conflict
errors.
- The API for undoing multiple transactions has changed. To undo
multiple transactions in a single transaction, pass a list of
transaction identifiers to a database's undoMultiple method. Calling a
database's undo method multiple times in the same transaction now
raises an exception.
- Corrupted or invalid cache files prevented ZEO clients from
starting. Now, bad cache files are moved aside.
- The ZEO protocol for undo has changed. The only user-visible
consequence of this is that when ZODB 3.10 ZEO servers won't support
undo for older clients.
- Invalidations of object records in ZEO caches, where the
invalidation transaction ids matched the cached transaction ids
should have been ignored.
- The storage API (IStorage) has been tightened. Now, storages should
raise a StorageTransactionError when invalid transactions are passed
to tpc_begin, tpc_vote, or tpc_finish.
- Conflict errors didn't invalidate ZEO cache entries.
- ZEO clients (``ClientStorage`` instances) now work in forked processes,
including those created via ``multiprocessing.Process`` instances.
- Broken objects now provide the IBroken interface.
3.10.0b1 (2010-05-18)
=====================
- As a convenience, you can now pass an integer port as an address to
the ZEO ClientStorage constructor.
New Features
------------
- As a convenience, there's a new ``client`` function in the ZEO
package for constructing a ClientStorage instance. It takes the
same arguments as the ClientStorage constructor.
- DemoStorages now accept constructor athuments, close_base_on_close
and close_changes_on_close, to control whether underlying storages
......@@ -250,31 +85,27 @@ New Features
iterator implementations should just raise StopIteration, which
means they can now be implemented as generators.
- The file-storage backup script, repozo, will now create a backup
index file if an output file name is given via the --output/-o
option.
- The filestorage packer configuration option noe accepts calues of
- The filestorage packer configuration option noe accepts values of
the form ``modname:expression``, allowing the use of packer
factories with options.
Bugs Fixed
----------
- Added a new API that allows applications to make sure that current
data are read. For example, with::
- BTree sets and tree sets didn't correctly check values passed to
update or to constructors, causing Python to exit under certain
circumstances.
self._p_jar.readCurrent(ob)
3.10.0a2 (2010-05-04)
=====================
A conflict error will be raised if the version of ob read by the
transaction isn't current when the transaction is committed.
New Features
------------
Normally, ZODB only assures that objects read are consistent, but not
necessarily up to date. Checking whether an object is up to date is
important when information read from one object is used to update
another.
- Added a '--kill-old-on-full' argument to the repozo backup options:
if passed, remove any older full or incremental backup files from the
repository after doing a full backup.
(https://bugs.launchpad.net/zope2/+bug/143158)
BTrees are an important case of reading one object to update
another. Internal nodes are read to decide which leave notes are
updated when a BTree is updated. BTrees now use this new API to
make sure that internal nodes are up to date on updates.
- When transactions are aborted, new object ids allocated during the
transaction are saved and used in subsequent transactions. This can
......@@ -291,635 +122,115 @@ New Features
clients corresponding to server log entries, especially when there
are multiple clients originating from the same machine.
- Improved ZEO server commit lock logging. Now, locking activity is
logged at the debug level until the number of waiting lock requests
gets above 3. Log at the critical level when the number of waiting
lock requests gets above 9.
- The file-storage backup script, repozo, will now create a backup
index file if an output file name is given via the --output/-o
option.
- Added a '--kill-old-on-full' argument to the repozo backup options:
if passed, remove any older full or incremental backup files from the
repository after doing a full backup.
(https://bugs.launchpad.net/zope2/+bug/143158)
- The mkzeoinst script has been moved to a separate project:
http://pypi.python.org/pypi/zope.mkzeoinstance
and is no-longer included with ZODB.
- Improved ZEO server commit lock logging. Now, locking activity is
logged at the debug level until the number of waiting lock requests
gets above 3. Log at the critical level when the number of waiting
lock requests gets above 9.
- Removed untested unsupported dbmstorage fossile.
- ZEO servers no longer log their pids in every log message. It's just
not interesting. :)
Bugs Fixed
Bugs fixed
----------
- Fixed bug in copying a BTrees.Length instance.
(https://bugs.launchpad.net/zodb/+bug/516653)
- Fixed bug in cPickleCache's byte size estimation logic.
(https://bugs.launchpad.net/zodb/+bug/533015)
- Fixed a serious bug that caused cache failures when run
with Python optimization turned on.
- When a pool timeout was specified for a database and old connections
were removed due to timing out, an error occured due to a bug in the
connection cleanup logic.
https://bugs.launchpad.net/zodb/+bug/544305
- When multi-database connections were no longer used and cleaned up,
their subconnections weren't cleaned up properly.
- When using using a ClientStorage in a Storage server, there was a
threading bug that caused clients to get disconnected.
- ZEO didn't work with IPv6 addrsses.
Added IPv6 support contributed by Martin v. Löwis.
- Fixed a bug that caused savepoint rollback to not properly
set object state when objects implemented _p_invalidate methods
that reloaded ther state (unghostifiable objects).
- A file storage bug could cause ZEO clients to have incorrect
information about current object revisions after reconnecting to a
database server.
https://bugs.launchpad.net/zodb/+bug/428039
- Updated the 'repozo --kill-old-on-full' option to remove any '.index'
files corresponding to backups being removed.
- cross-database wekrefs weren't handled correctly.
- ZEO extension methods failed when a client reconnected to a
storage. (https://bugs.launchpad.net/zodb/+bug/143344)
https://bugs.launchpad.net/zodb/+bug/435547
- Clarified the return Value for lastTransaction in the case when
there aren't any transactions. Now a string of 8 nulls (aka "z64")
is specified.
- Fixed some problems in ZEO server commit lock management.
- Setting _p_changed on a blob wo actually writing anything caused an
error. (https://bugs.launchpad.net/zodb/+bug/440234)
- On Mac OS X, clients that connected and disconnected quickly could
cause a ZEO server to stop accepting connections, due to a failure
to catch errors in the initial part of the connection process.
- The verbose mode of the fstest was broken.
(https://bugs.launchpad.net/zodb/+bug/475996)
The failure to properly handle exceptions while accepting
connections is potentially problematic on other platforms.
- Object ids created in a savepoint that is rolled back wren't being
reused. (https://bugs.launchpad.net/zodb/+bug/588389)
Fixes: https://bugs.launchpad.net/zodb/+bug/135108
- Database connections didn't invalidate cache entries when conflict
errors were raised in response to checkCurrentSerialInTransaction
errors. Normally, this shouldn't be a problem, since there should be
pending invalidations for these oids which will cause the object to
be invalidated. There have been issues with ZEO persistent cache
management that have caused out of date data to remain in the cache.
(It's possible that the last of these were addressed in the
3.10.0b5.) Invalidating read data when there is a conflict error
provides some extra insurance.
3.10.0a1 (2010-02-08)
=====================
- The interface, ZODB.interfaces.IStorage was incorrect. The store
method should never return a sequence of oid and serial pairs.
New Features
------------
- When a demo storage push method was used to create a new demo
storage and the new storage was closed, the original was
(incorrectly) closed.
- There are a number of performance enhancements for ZEO storage
servers.
- There were numerous bugs in the ZEO cache tracing and analysis code.
Cache simulation, while not perfect, seems to be much more accurate
now than it was before.
- FileStorage indexes use a new format. They are saved and loaded much
faster and take less space. Old indexes can still be read, but new
indexes won't be readable by older versions of ZODB.
The ZEO cache trace statistics and simulation scripts have been
given more descriptive names and moved to the ZEO scripts package.
- The API for undoing multiple transactions has changed. To undo
multiple transactions in a single transaction, pass a list of
transaction identifiers to a database's undoMultiple method. Calling a
database's undo method multiple times in the same transaction now
raises an exception.
- BTree sets and tree sets didn't correctly check values passed to
update or to constructors, causing Python to exit under certain
circumstances.
- The ZEO protocol for undo has changed. The only user-visible
consequence of this is that when ZODB 3.10 ZEO servers won't support
undo for older clients.
- Fixed bug in copying a BTrees.Length instance.
(https://bugs.launchpad.net/zodb/+bug/516653)
- The storage API (IStorage) has been tightened. Now, storages should
raise a StorageTransactionError when invalid transactions are passed
to tpc_begin, tpc_vote, or tpc_finish.
- Fixed a serious bug that caused cache failures when run
with Python optimization turned on.
- ZEO clients (``ClientStorage`` instances) now work in forked processes,
including those created via ``multiprocessing.Process`` instances.
https://bugs.launchpad.net/zodb/+bug/544305
- Broken objects now provide the IBroken interface.
- When using using a ClientStorage in a Storage server, there was a
threading bug that caused clients to get disconnected.
- As a convenience, you can now pass an integer port as an address to
the ZEO ClientStorage constructor.
- On Mac OS X, clients that connected and disconnected quickly could
cause a ZEO server to stop accepting connections, due to a failure
to catch errors in the initial part of the connection process.
- As a convenience, there's a new ``client`` function in the ZEO
package for constructing a ClientStorage instance. It takes the
same arguments as the ClientStorage constructor.
The failure to properly handle exceptions while accepting
connections is potentially problematic on other platforms.
Bugs Fixed
----------
Fixes: https://bugs.launchpad.net/zodb/+bug/135108
- Object state management wasn't done correctly when classes
implemented custom _p_deavtivate methods.
(https://bugs.launchpad.net/zodb/+bug/185066)
3.9.4 (2009-12-14)
==================
Bugs Fixed
----------
- A ZEO threading bug could cause transactions to read inconsistent
data. (This sometimes caused an AssertionError in
Connection._setstate_noncurrent.)
- DemoStorage.loadBefore sometimes returned invalid data which
would trigger AssertionErrors in ZODB.Connection.
- History support was broken when using stprages that work with ZODB
3.8 and 3.9.
- zope.testing was an unnecessary non-testing dependency.
- Internal ZEO errors were logged at the INFO level, rather
than at the error level.
- The FileStorage backup and restore script, repozo, gave a
deprecation warning under Python 2.6.
- C Header files weren't installed correctly.
- The undo implementation was incorrect in ways that could cause
subtle missbehaviors.
3.9.3 (2009-10-23)
==================
Bugs Fixed
----------
- 2 BTree bugs, introduced by a bug fix in 3.9.0c2, sometimes caused
deletion of keys to be improperly handled, resulting in data being
available via iteraation but not item access.
3.9.2 (2009-10-13)
==================
Bugs Fixed
----------
- ZEO manages a separate thread for client network IO. It created
this thread on import, which caused problems for applications that
implemented daemon behavior by forking. Now, the client thread
isn't created until needed.
- File-storage pack clean-up tasks that can take a long time
unnecessarily blocked other activity.
- In certain rare situations, ZEO client connections would hang during
the initial connection setup.
3.9.1 (2009-10-01)
==================
Bugs Fixed
----------
- Conflict errors committing blobs caused ZEO servers to stop committing
transactions.
3.9.0 (2009-09-08)
==================
New Features (in more or less reverse chronological order)
----------------------------------------------------------
- The Database class now has an ``xrefs`` keyword argument and a
corresponding allow-implicit-cross-references configuration option.
which default to true. When set to false, cross-database references
are disallowed.
- Added support for RelStorage.
- As a convenience, the connection root method for returning the root
object can now *also* be used as an object with attributes mapped to
the root-object keys.
- Databases have a new method, ``transaction``, that can be used with the
Python (2.5 and later) ``with`` statement::
db = ZODB.DB(...)
with db.transaction() as conn:
# ... do stuff with conn
This uses a private transaction manager for the connection.
If control exits the block without an error, the transaction is
committed, otherwise, it is aborted.
- Convenience functions ZODB.connection and ZEO.connection provide a
convenient way to open a connection to a database. They open a
database and return a connection to it. When the connection is
closed, the database is closed as well.
- The ZODB.config databaseFrom... methods now support
multi-databases. If multiple zodb sections are used to define
multiple databases, the databases are connected in a multi-database
arrangement and the first of the defined databases is returned.
- The zeopack script has gotten a number of improvements:
- Simplified command-line interface. (The old interface is still
supported, except that support for ZEO version 1 servers has been
dropped.)
- Multiple storages can be packed in sequence.
- This simplifies pack scheduling on servers serving multiple
databases.
- All storages are packed to the same time.
- You can now specify a time of day to pack to.
- The script will now time out if it can't connect to s storage in
60 seconds.
- The connection now estimates the object size based on its pickle size
and informs the cache about size changes.
The database got additional configurations options (`cache-size-bytes`
and `historical-cache-size-bytes`) to limit the
cache size based on the estimated total size of cached objects.
The default values are 0 which has the interpretation "do not limit
based on the total estimated size".
There are corresponding methods to read and set the new configuration
parameters.
- Connections now have a public ``opened`` attribute that is true when
the connection is open, and false otherwise. When true, it is the
seconds since the epoch (time.time()) when the connection was
opened. This is a renaming of the previous ``_opened`` private
variable.
- FileStorage now supports blobs directly.
- You can now control whether FileStorages keep .old files when packing.
- POSKeyErrors are no longer logged by ZEO servers, because they are
really client errors.
- A new storage interface, IExternalGC, to support external garbage
collection, http://wiki.zope.org/ZODB/ExternalGC, has been defined
and implemented for FileStorage and ClientStorage.
- As a small convenience (mainly for tests), you can now specify
initial data as a string argument to the Blob constructor.
- ZEO Servers now provide an option, invalidation-age, that allows
quick verification of ZEO clients have been disconnected for less
than a given time even if the number of transactions the client
hasn't seen exceeds the invalidation queue size. This is only
recommended if the storage being served supports efficient iteration
from a point near the end of the transaction history.
- The FileStorage iterator now handles large files better. When
iterating from a starting transaction near the end of the file, the
iterator will scan backward from the end of the file to find the
starting point. This enhancement makes it practical to take
advantage of the new storage server invalidation-age option.
- Previously, database connections were managed as a stack. This
tended to cause the same connection(s) to be used over and over.
For example, the most used connection would typically be the only
connection used. In some rare situations, extra connections could
be opened and end up on the top of the stack, causing extreme memory
wastage. Now, when connections are placed on the stack, they sink
below existing connections that have more active objects.
- There is a new pool-timeout database configuration option to specify that
connections unused after the given time interval should be garbage
collection. This will provide a means of dealing with extra
connections that are created in rare circumstances and that would
consume an unreasonable amount of memory.
- The Blob open method now supports a new mode, 'c', to open committed
data for reading as an ordinary file, rather than as a blob file.
The ordinary file may be used outside the current transaction and
even after the blob's database connection has been closed.
- ClientStorage now provides blob cache management. When using
non-shared blob directories, you can set a target cache size and the
cache will periodically be reduced try to keep it below the target size.
The client blob directory layout has changed. If you have existing
non-shared blob directories, you will have to remove them.
- ZODB 3.9 ZEO clients can connect to ZODB 3.8 servers. ZODB ZEO clients
from ZODB 3.2 on can connect to ZODB 3.9 servers.
- When a ZEO cache is stale and would need verification, a
ZEO.interfaces.StaleCache event is published (to zope.event).
Applications may handle this event and take action such as exiting
the application without verifying the cache or starting cold.
- There's a new convenience function, ZEO.DB, for creating databases
using ZEO Client Storages. Just call ZEO.DB with the same arguments
you would otherwise pass to ZEO.ClientStorage.ClientStorage::
import ZEO
db = ZEO.DB(('some_host', 8200))
- Object saves are a little faster
- When configuring storages in a storage server, the storage name now
defaults to "1". In the overwhelmingly common case that a single
storage, the name can now be omitted.
- FileStorage now provides optional garbage collection. A 'gc'
keyword option can be passed to the pack method. A false value
prevents garbage collection.
- The FileStorage constructor now provides a boolean pack_gc option,
which defaults to True, to control whether garbage collection is
performed when packing by default. This can be overridden with the
gc option to the pack method.
The ZConfig configuration for FileStorage now includes a pack-gc
option, corresponding to the pack_gc constructor argument.
- The FileStorage constructor now has a packer keyword argument that
allows an alternative packer to be supplied.
The ZConfig configuration for FileStorage now includes a packer
option, corresponding to the packer constructor argument.
- MappingStorage now supports multi-version concurrency control and
iteration and provides a better storage implementation example.
- DemoStorage has a number of new features:
- The ability to use a separate storage, such as a file storage to
store changes
- Blob support
- Multi-version concurrency control and iteration
- Explicit support for demo-storage stacking via push and pop methods.
- Wen calling ZODB.DB to create a database, you can now pass a file
name, rather than a storage to use a file storage.
- Added support for copying and recovery of blob storages:
- Added a helper function, ZODB.blob.is_blob_record for testing whether
a data record is for a blob. This can be used when iterating over a
storage to detect blob records so that blob data can be copied.
In the future, we may want to build this into a blob-aware
iteration interface, so that records get blob file attributes
automatically.
- Added the IBlobStorageRestoreable interfaces for blob storages
that support recovery via a restoreBlob method.
- Updated ZODB.blob.BlobStorage to implement
IBlobStorageRestoreable and to have a copyTransactionsFrom method
that also copies blob data.
- New `ClientStorage` configuration option `drop_cache_rather_verify`.
If this option is true then the ZEO client cache is dropped instead of
the long (unoptimized) verification. For large caches, setting this
option can avoid effective down times in the order of hours when
the connection to the ZEO server was interrupted for a longer time.
- Cleaned-up the storage iteration API and provided an iterator implementation
for ZEO.
- Versions are no-longer supported.
- Document conflict resolution (see ZODB/ConflictResolution.txt).
- Support multi-database references in conflict resolution.
- Make it possible to examine oid and (in some situations) database
name of persistent object references during conflict resolution.
- Moved the 'transaction' module out of ZODB.
ZODB depends upon this module, but it must be installed separately.
- ZODB installation now requires setuptools.
- Added `offset` information to output of `fstail`
script. Added test harness for this script.
- Added support for read-only, historical connections based
on datetimes or serials (TIDs). See
src/ZODB/historical_connections.txt.
- Removed the ThreadedAsync module.
- Now depend on zc.lockfile
Bugs Fixed
----------
- CVE-2009-2701: Fixed a vulnerability in ZEO storage servers when
blobs are available. Someone with write access to a ZEO server
configured to support blobs could read any file on the system
readable by the server process and remove any file removable by the
server process.
- BTrees (and TreeSets) kept references to internal keys.
https://bugs.launchpad.net/zope3/+bug/294788
- BTree Sets and TreeSets don't support the standard set add method.
(Now either add or the original insert method can be used to add an
object to a BTree-based set.)
- The runzeo script didn't work without a configuration file.
(https://bugs.launchpad.net/zodb/+bug/410571)
- Officially deprecated PersistentDict
(https://bugs.launchpad.net/zodb/+bug/400775)
- Calling __setstate__ on a persistent object could under certain
uncommon cause the process to crash.
(https://bugs.launchpad.net/zodb/+bug/262158)
- When committing transactions involving blobs to ClientStorages with
non-shared blob directories, a failure could occur in tpc_finish if
there was insufficient disk space to copy the blob file or if the
file wasn't available. https://bugs.launchpad.net/zodb/+bug/224169
- Savepoint blob data wasn't properly isolated. If multiple
simultaneous savepoints in separate transactions modified the same
blob, data from one savepoint would overwrite data for another.
- Savepoint blob data wasn't cleaned up after a transaction abort.
https://bugs.launchpad.net/zodb/+bug/323067
- Opening a blob with modes 'r+' or 'a' would fail when the blob had no
committed changes.
- PersistentList's sort method did not allow passing of keyword parameters.
Changed its sort parameter list to match that of its (Python 2.4+)
UserList base class.
- Certain ZEO server errors could cause a client to get into a state
where it couldn't commit transactions.
https://bugs.launchpad.net/zodb/+bug/374737
- Fixed vulnerabilities in the ZEO network protocol that allow:
- CVE-2009-0668 Arbitrary Python code execution in ZODB ZEO storage servers
- CVE-2009-0669 Authentication bypass in ZODB ZEO storage servers
The vulnerabilities only apply if you are using ZEO to share a
database among multiple applications or application instances and if
untrusted clients are able to connect to your ZEO servers.
- Fixed the setup test command. It previously depended on private
functions in zope.testing.testrunner that don't exist any more.
- ZEO client threads were unnamed, making it hard to debug thread
management.
- ZEO protocol 2 support was broken. This caused very old clients to
be unable to use new servers.
- zeopack was less flexible than it was before. -h should default to
local host.
- The "lawn" layout was being selected by default if the root of
the blob directory happened to contain a hidden file or directory
such as ".svn". Now hidden files and directories are ignored
when choosing the default layout.
- BlobStorage was not compatible with MVCC storages because the
wrappers were being removed by each database connection. Fixed.
- Saving indexes for large file storages failed (with the error:
RuntimeError: maximum recursion depth exceeded). This can cause a
FileStorage to fail to start because it gets an error trying to save
its index.
- Sizes of new objects weren't added to the object cache size
estimation, causing the object-cache size limiting feature to let
the cache grow too large when many objects were added.
- Deleted records weren't removed when packing file storages.
- Fixed analyze.py and added test.
- fixed Python 2.6 compatibility issue with ZEO/zeoserverlog.py
- using hashlib.sha1 if available in order to avoid DeprecationWarning
under Python 2.6
- made runzeo -h work
- The monitor server didn't correctly report the actual number of
clients.
- Packing could return spurious errors due to errors notifying
disconnected clients of new database size statistics.
- Undo sometimes failed for FileStorages configured to support blobs.
- Starting ClientStorages sometimes failed with non-new but empty
cache files.
- The history method on ZEO clients failed.
- Fix for bug #251037: Make packing of blob storages non-blocking.
- Fix for bug #220856: Completed implementation of ZEO authentication.
- Fix for bug #184057: Make initialisation of small ZEO client file cache
sizes not fail.
- Fix for bug #184054: MappingStorage used to raise a KeyError during `load`
instead of a POSKeyError.
- Fixed bug in Connection.TmpStore: load() would not defer to the backend
storage for loading blobs.
- Fix for bug #181712: Make ClientStorage update `lastTransaction` directly
after connecting to a server, even when no cache verification is necessary.
- Fixed bug in blob filesystem helper: the `isSecure` check was inverted.
- Fixed bug in transaction buffer: a tuple was unpacked incorrectly in
`clear`.
- Bugfix the situation in which comparing persistent objects (for
instance, as members in BTree set or keys of BTree) might cause data
inconsistency during conflict resolution.
- Fixed bug 153316: persistent and BTrees were using `int`
for memory sizes which caused errors on x86_64 Intel Xeon machines
(using 64-bit Linux).
- Fixed small bug that the Connection.isReadOnly method didn't
work after a savepoint.
- Bug #98275: Made ZEO cache more tolerant when invalidating current
versions of objects.
- Fixed a serious bug that could cause client I/O to stop
(hang). This was accompanied by a critical log message along the
lines of: "RuntimeError: dictionary changed size during iteration".
- Fixed bug #127182: Blobs were subclassable which was not desired.
- Fixed bug #126007: tpc_abort had untested code path that was
broken.
- Fixed bug #129921: getSize() function in BlobStorage could not
deal with garbage files
- Fixed bug in which MVCC would not work for blobs.
- Fixed bug in ClientCache that occurred with objects larger than the total
cache size.
- When an error occured attempting to lock a file and logging of said error was
enabled.
- FileStorages previously saved indexes after a certain
number of writes. This was done during the last phase of two-phase
commit, which made this critical phase more subject to errors than
it should have been. Also, for large databases, saves were done so
infrequently as to be useless. The feature was removed to reduce
the chance for errors during the last phase of two-phase commit.
- File storages previously kept an internal object id to
transaction id mapping as an optimization. This mapping caused
excessive memory usage and failures during the last phase of
two-phase commit. This optimization has been removed.
- Refactored handling of invalidations on ZEO clients to fix
a possible ordering problem for invalidation messages.
- On many systems, it was impossible to create more than 32K
blobs. Added a new blob-directory layout to work around this
limitation.
- Fixed bug that could lead to memory errors due to the use
of a Python dictionary for a mapping that can grow large.
- Fixed bug #251037: Made packing of blob storages non-blocking.
- Fixed a bug that could cause InvalidObjectReference errors
for objects that were explicitly added to a database if the object
was modified after a savepoint that added the object.
- Fixed several bugs that caused ZEO cache corruption when connecting
to servers. These bugs affected both persistent and non-persistent caches.
- Improved the the ZEO client shutdown support to try to
avoid spurious errors on exit, especially for scripts, such as zeopack.
- Packing failed for databases containing cross-database references.
- Cross-database references to databases with empty names
weren't constructed properly.
- The zeo client cache used an excessive amount of memory, causing applications
with large caches to exhaust available memory.
- Fixed a number of bugs in the handling of persistent ZEO caches:
- Cache records are written in several steps. If a process exits
after writing begins and before it is finishes, the cache will be
corrupt on restart. The way records are written was changed to
make cache record updates atomic.
- There was no lock file to prevent opening a cache multiple times
at once, which would lead to corruption. Persistent caches now
use lock files, in the same way that file storages do.
- A bug in the cache-opening logic led to cache failure in the
unlikely event that a cache has no free blocks.
- When using ZEO Client Storages, Errors occured when trying to store
objects too big to fit in the ZEO cache file.
- Fixed bug in blob filesystem helper: the `isSecure` check was inverted.
- Fixed bug in transaction buffer: a tuple was unpacked incorrectly in
`clear`.
- Fixed bug in Connection.TmpStore: load() would not defer to the
back-end storage for loading blobs.
- Fixed bug #190884: Wrong reference to `POSKeyError` caused NameError.
- Completed implementation of ZEO authentication. This fixes issue 220856.
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