Re: Packing, again
Toby Dickenson <[email protected]>
| Newsgroups | gmane.comp.web.zope.zodb.dirstorage |
|---|---|
| Message-ID | <[email protected]> |
On Sunday 05 Sep 2004 10:50, Toby Dickenson wrote: > I'm very confident that an interrupted > pack wont corrupt the current version of the data, and pretty confident > that it wont cause problems when looking at historical revisions of > objects, or doing an undo etc. But there could still be a corner case bug > where an interrupted pack can cause trouble for a subsequent pack. There _are_ several corner cases that can be caused by an interrupted pack because the bulk file deletion is not handled atomically. It is possible for an interruption in phase 4 to leave some objects 'half deleted'. This can cause checkds to report problems. *all* of these problems can be fixed by repeating the pack and allowing it to finish. However you do need the pack time to be no longer than in the interrupted pack. It is possible for the second pack in the following scenario to fail.... does this apply to you? a. many things were deleted 2 days ago b. start packing keeping 1 day of history. interrupt it during phase 4. c. start packing keeping 3 days of history. To resolve these problem, you need to pack keeping 1 day of history ... the same setting as the pack that was interrupted in step b. > You > might not be any data corruption at all.... ------------------------------------------------------- This SF.Net email is sponsored by BEA Weblogic Workshop FREE Java Enterprise J2EE developer tools! Get your free copy of BEA WebLogic Workshop 8.1 today. http://ads.osdn.com/?ad_id=5047&alloc_id=10808&op=click