[Zope-Annce] DirectoryStorage: data loss bug
toby at tarind.com
Tue Nov 9 16:42:17 EST 2004
DirectoryStorage is a robust, manageable, fault-tolerant, scalable storage for
A bug has been discovered affecting all currently released versions, which can
cause data loss when packing.
A necessary condition for triggering this bug is for some storage files to be
owned by a uid different to that of the storage process at the point the pack
is run. This scenario will not occur naturally during normal operation - no
storage will be affected by this bug unless an administrator has been
manually changing ownership of files or processes.
All damage caused by this bug can be manually undone using DirectoryStorage's
delayed deletion feature, provided the damage is discovered in time. In the
default configuration, within 10 days of the pack that caused the damage. For
more information see http://dirstorage.sourceforge.net/FAQ.html#deleted
The damage will appear as a POSKeyError when accessing damaged objects. All
damage caused by this bug can be detected using DirectoryStorage's checkds
storage checking tool. If checkds finds no problem then your storage is
Please raise any questions about this problem on
dirstorage-users at lists.sourceforge.net. Fixes will be made available shortly.
My apologies to anyone inconvenienced by this issue. Thanks to
Matt Hamilton for uncovering the problem.
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