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List: gluster-devel
Subject: [Gluster-devel] AFR documentation
From: johnson () nmr ! mgh ! harvard ! edu (Chris Johnson)
Date: 2007-10-19 12:32:14
Message-ID: Pine.LNX.4.62.0710190831010.5317 () maequeses ! nmr ! mgh ! harvard ! edu
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On Fri, 19 Oct 2007, Thierry EXCOFFIER wrote:
My $0.02. First rule of both science and engineering, never
assume. It almost always causes big problems.
> Krishna Srinivas wrote:
>>> - If the version numbers are identicals, do you detect that
>>> the file content is not the same ?
>>
>> No. But we can have improve the safety level to handle such cases
>> by further checking if the copies differ by mtime (by more than 30 secs,
>> say)
>> or if they have different file sizes etc in which case we can return EIO.
>> Again suggestions are welcome.
>
> Can you store the IP of the last client who have modified the file ?
> If the version is the same but not the client IP then the file
> content is in an inpredictable state.
>
> May be you could assume that if the file is wrote by more than one
> client then the *user application* has locked the file before.
> In this case you need an option to indicate to AFR that
> the file locking succeed only if all the clients are up.
>
> Hope my 2 cents may help.
>
> Thierry.
> --
> Thierry.EXCOFFIER@@liris.univ-lyon1.fr// GO: Oriental Strategy Game
> LIRIS/UFR Informatique, bat710 //DYLAN: Programming Language
> Universite Claude Bernard LYON 1 __// UNIX: Standard Operating System
> 43 Bd du 11 novembre 1918 //
> 69622 VILLEURBANNE, FRANCE //WWW: http://www710.univ-lyon1.fr/~exco
>
>
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>
>
>
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