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| lepri | hi guys | 20:43 |
|---|---|---|
| lepri | someone know some information about this? | 20:43 |
| lepri | http://www.teamrubber.com/blog/the-case-of-the-phantom-data-fs/ | 20:43 |
| lepri | if this is a bug | 20:43 |
| betabug | looks like the client cache still had the old data - but no idea how that could happen, as writes would have been "given" to the ZEO server | 20:46 |
| betabug | but reading the conclusion "If you ever have to replace your Data.fs, restart your zeoserver as soon as you do so.", I'd say that's pretty obvious | 20:46 |
| betabug | in fact I would shut down the ZEO server before replacing the Data.fs | 20:47 |
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| betabug | lepri: tried to leave a comment, but your blog ate it ;-) | 20:50 |
| kosh | actually this is because of how unix works | 20:51 |
| kosh | unix files systems are refcounted | 20:51 |
| kosh | once the refcount drops the zero the file will be deleted | 20:51 |
| kosh | if you have a file open in an app and delete it from somewhere else the file is not delete until the app closes since it has an open filehandle | 20:51 |
| betabug | so ZEO continued to write to the ghost file | 20:52 |
| kosh | well it is not a ghost file | 20:52 |
| kosh | ZEO has no idea the file was delete from the cli, file manager etc | 20:52 |
| kosh | the file it has open is still completely valid | 20:53 |
| kosh | if you tell it to pack the file you will have a fully working packed database | 20:53 |
| betabug | yupp | 20:53 |
| kosh | and a file entry will exist in file managers, cli etc again | 20:53 |
| kosh | it is actually a very useful feature | 20:53 |
| betabug | but it would be hard to bring it back | 20:53 |
| kosh | it is why you can upgrade a unix box and not reboot | 20:53 |
| kosh | if you pack it you get it back pretty much minus history | 20:54 |
| kosh | so long as it does not crash while packing | 20:54 |
| betabug | right | 20:54 |
| lepri | betabug: its not my blog, but this happend with me today | 20:54 |
| betabug | lepri: aha | 20:54 |
| kosh | lepri: the point is that it has nothing to do with ZEO or Zope it is a general unix thing | 20:54 |
| lepri | kosh: ok... | 20:55 |
| lepri | thanks for explanation, guys! :-) | 20:56 |
| lepri | kosh: there anything we can do for this not happen again? | 21:00 |
| betabug | sure, shut down ZEO before replacing a Data.fs - the obvious thing | 21:00 |
| kosh | shut down zope, shut down zeo, replace Data.fs, start zeo, start zope | 21:02 |
| lepri | betabug: but we didn't do this... we just restart the zeo server | 21:02 |
| betabug | I think kosh answered that :-) | 21:06 |
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