[Gluster-devel] AFR write completion? AFR read redundancy?

[Martin Fick]

--- Anand Avati <avati at zresearch.com> wrote:
> > Cool. In the case of mixed results (some success,
> > some failures), what is the result?  Anyway to
> > distinguish this from a complete success?
> 
> any one success is considered transactions success.
> fixing the failed operations is part of next open() 
> (self-heal).

Will self healing prevent an inconsistent cluster from
happening?  I.E. Two node cluster, A+B. 

1) Node A goes down
2) Write occurs on Node B
3) Node B goes down (cluster is down)
4) Node A comes up -> cluster is inconsistent since B
is not yet available.  Cluster should still be "down".



> Any plans for such a feature?  HA is great, but so
> is error resilience/correction. :)
> 
> we have thoughs of checksum based error
> detection/correction. Infact one of
> the users has submitted a n ECC based translator
> (yet to be reviewed seriously). But no plans of 
> making it part of AFR. 

So this ECC AFR would work on a single subvolume then?

> We are in fact even thinking of raid5 or raid6 
> kind of translator which does checksum based error 
> detection/recover to some extent.

Would this be a part of AFR, or a completely new
translator?

Thx again,

-Martin



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