[Box Backup] Disturbing bug

Jan Haastrecht jan.haastrecht at gmail.com
Thu Nov 29 21:06:29 GMT 2012


Chris Wilson schreef:
> Hi Jan,
>
> On Thu, 29 Nov 2012, Jan Haastrecht wrote:
>> Chris Wilson schreef:
>>>
>>>> The following line in BUGS.txt in SVN seems rather disturbing: "if a file 
>>>> changes while it's being streamed to the server, bad things will happen"
>>>
>>> I'm not sure how possible it is to fix this without snapshot support in the 
>>> underlying OS/filesystem/storage, integrated with Box Backup, which we don't 
>>> currently have except on Windows using VSS (unsupported).
>>
>> How about 
>> http://kernel.org/doc/Documentation/filesystems/mandatory-locking.txt ?
>
> It's an option, but I'm reluctant to do anything that might lock people out of 
> their files while they're being backed up. On Windows this has been a major 
> issue which has forced people to use VSS even though it's non-free and 
> non-redistributable at the moment.
>
> Another option is that we could checksum the entire file on both sides after 
> upload and discard the update if they don't match. That's what rdiff-backup does.
That would be a good solution and there could also be some tracking to make sure 
that there are not some files which have been open since a very long time and 
because of that won't be backed up.
>
> Cheers, Chris.




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