Re: [Gluster-devel] IMPORTANT: AFR Users

[Anand Babu Periasamy]

Brandon Lamb wrote:
> On Fri, May 9, 2008 at 2:53 PM, Anand Babu Periasamy <address@hidden> wrote:
> > RACE CONDITION IN AFR:
> > ----------------------
> > * Who is affected?
> > If you are using AFR in a multi-user environment and your applications
> > are writing to common files without locks, there is a possibility
> > CORRUPTION.
> >
> > GlusterFS is expected to write atomically across replicated volumes
> > when the files are opened with O_APPEND mode, irrespective of locks.
> > Fix in works will ensure all writes to be atomic always. We will
> > make an announcement shortly.
> >
> > Thanks to Gordan Bobic and Martin Fick for identifying this bug.
> >
> > --
> > Anand Babu Periasamy
> > GPG Key ID: 0x62E15A31
> > Blog [http://ab.freeshell.org]
> > The GNU Operating System [http://www.gnu.org]
> > Z RESEARCH Inc [http://www.zresearch.com]
> >
> >
> >
> > _______________________________________________
> > Gluster-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/gluster-devel
>
> Is corruption the correct word here, or would it be more accurate to
> say "inconsistent"? I suppose it is a point of view.
>
> It is just that to me corruption means the data in my files is
> unusable, which is slightly different than the data is "good" on both
> copies, they just are not the SAME. I could still at least pick one to
> use, whereas corruption to means I have no good data.
>
> Unimportant maybe but corruption might freak people out a little more
>
> =P

You are correct. No information is lost, but files get inconsistent.
This is still a very critical issue to us. Being in the file system
space, we should always be paranoid about reliability and correctness.

--
Anand Babu Periasamy
GPG Key ID: 0x62E15A31
Blog [http://ab.freeshell.org]
The GNU Operating System [http://www.gnu.org]
Z RESEARCH Inc [http://www.zresearch.com]