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| jakke1 | Hi guys, I'm having a StorageTransactionError in ZODB.BaseStorage | 12:16 |
|---|---|---|
| jakke1 | plone4.1 with ZODB-3.10.3 and transaction-1.1.1 | 12:16 |
| jakke1 | trying to do a multiple undo in the ZMI | 12:16 |
| jakke1 | I can't find any reported bug on this in de zope bug reports | 12:17 |
| jakke1 | anyone seen this before or hints where to start debugging? | 12:17 |
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| kosh | jakke1: what are you trying to do when you get that error? | 15:22 |
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| jakke1 | |kosh | 15:49 |
| kosh | what? | 15:50 |
| jakke1 | I'm running an undo in plone; trying to roll back the removal of 3 files in a folder | 15:50 |
| jakke1 | running pdb now in transaction-1.1.1/transaction/_transaction.py; but my mental model of what's going on is not right yet | 15:50 |
| kosh | are you undoing multiple transactions or just one? how are you doing the undo? have other things tried to change those same documents since the files where deleted? | 15:52 |
| jakke1 | multiple undo | 15:52 |
| jakke1 | I deleted 3 files; one by one. Then select those 3 actions in the undo window int he zmi and click undo | 15:52 |
| kosh | what about other things that have tried to add or remove files in the same folder since then? where those files put in the catalog? etc | 15:54 |
| kosh | how long ago did it happen? | 15:56 |
| jakke1 | one single undo action is not a problem | 15:56 |
| jakke1 | how long ago: today, as soon as I started debugging the issue; around 10 this morning | 15:56 |
| kosh | so what happens if you undo them one at a time? | 15:57 |
| jakke1 | one at the time is no problem | 15:57 |
| kosh | so why not just do it that way? | 15:57 |
| jakke1 | multiple in the same batch is an issue | 15:57 |
| kosh | I have run into multiples undoing at the same time a problem but ony when they have modified some common resource | 15:58 |
| jakke1 | we have had issues doing that, but I haven't been able to reproduce that yet | 15:58 |
| jakke1 | I'm using files in the same folder; so the common resource is the folder | 15:59 |
| jakke1 | btw: the files do are in the portal_catalog | 15:59 |
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| jakke1 | tried a couple more scenarios | 16:04 |
| kosh | the odds are some common resource is causing a problem, you can try posting your question on the zope list but overall just try to undo them one by one and see if it works | 16:05 |
| jakke1 | it's ZODB-3.10.3 which requires transaction > 1.1.0 (having 1.1.1) | 16:05 |
| jakke1 | and the changelog somewhere states they made some checks more strict | 16:06 |
| jakke1 | tried to figure out with diff if there were changes in that part of the code where I started debugging, but that doesn't seem to be | 16:07 |
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| jakke1 | common resource seems to be pretty wide defined: remove Plone/a/b; remove Plone/b/c ; so a page in 2 folders that are next to each other | 16:13 |
| jakke1 | and still: StorageTransactionError Duplicate tpc_begin calls for same transaction | 16:13 |
| kosh | probably have the catalog in common | 16:13 |
| kosh | overall you can't rely on undo for anyting other then an emergency | 16:14 |
| jakke1 | we needed the undo for an emergence; due to another bug found by accident | 16:15 |
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| jakke1 | a folder that shouldn't be removed, could not be recovered (tried cut-n-paste, but only cut worked out and clipboard went empty) | 16:15 |
| jakke1 | and some other actions were done after that; so we had to undo 4-5 actions | 16:16 |
| jakke1 | that's why I'm debugging now | 16:16 |
| kosh | don't use cut and paste | 16:18 |
| kosh | use copy and paste and then delete | 16:18 |
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| jakke1 | it's not about us, we can hit the wall, find a solution and use it; it's about the users | 16:19 |
| kosh | the users are deleting stuff? | 16:19 |
| jakke1 | not all users realize they can get the same result with copy-paste-delete | 16:19 |
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| jakke1 | it happens that users delete stuff they din't want to be deleted too yes | 16:20 |
| kosh | ah that is not something I have run into | 16:20 |
| jakke1 | and since there is no trashbin, our first option is undo, the second is the whole backup procedure; zexp export import, ... | 16:20 |
| kosh | undoing tends to be a pretty nasty problem in most systems I have run into, better to figure out how not to have to undo | 16:21 |
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| jakke1 | I get your point, and that would be ideal, but also nearly impossible | 16:23 |
| jakke1 | the day you think you covered all usecases, some user will do something unforeseen and off you go again | 16:23 |
| jakke1 | too many options | 16:23 |
| kosh | yes and in any relational db system, nosql system etc you end up with a lot of problems trying to undo things | 16:24 |
| kosh | since future transactions depend on the state of previous transactions etc | 16:25 |
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| jakke1 | that's why it would be really nice to have the undo we had before | 16:33 |
| jakke1 | don't want to give up the comfort you're used to | 16:33 |
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| kosh | I suspect it was fixed because the old one would lead to some strange errors but ask on the zope dev list and find out | 16:37 |
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| jakke1 | I'm running on the latest code of transaction and ZODB, so I don't really get what you mean by the "old one" | 16:40 |
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| jakke1 | but I'll pop the question on the list as you suggest, thanks | 16:40 |
| kosh | the older transaction code that used to work for you I think had strange problems sometimes | 16:45 |
| kosh | like undoing putting the catalog in an inconsistent state | 16:45 |
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| jakke1 | ok, now it starts to make sence to me | 16:47 |
| jakke1 | sounds like I'll be playing way out of my league here, but having a look won't harm ;-) | 16:47 |
| kosh | I just remember there where some strange bugs and screwing up the catalog can screw up other things | 16:48 |
| kosh | especially in plone | 16:48 |
| kosh | so they probably tightened things up to fix that issue and broke some other case that you need | 16:48 |
| kosh | asking about in on zope-dev list though might give you a better solution | 16:48 |
| kosh | I do with cut and paste had been doing differently in zope though | 16:49 |
| kosh | it should have been implemented as copy paste verify delete | 16:49 |
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| jakke1 | got a suggestion from a colleague; I'm going to try if I have the same issue on plone4.0; to be sure it's not the catalog implementation | 17:03 |
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| kosh | not a clue for plone itself, I don't use it on any system | 17:22 |
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