[sheepdog] [RFC PATCH] farm: don't check of the existing object before slice_write

[MORITA Kazutaka]

At Fri, 19 Jul 2013 13:02:54 +0800,
Liu Yuan wrote:
> 
> On Fri, Jul 19, 2013 at 01:33:16PM +0900, MORITA Kazutaka wrote:
> > Currently, we stores sliced objects for the farm store, so
> > sha1_file_exist() fails always.
> > 
> > Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
> > ---
> > 
> > Other approaches are:
> > 
> >  - Calculate the sha1 digest before slicing objects and store the
> >    value to the farm store so that sha1_file_exist() can check it.
> > 
> >  - Make sheep return the hash value of the sliced data.
> > 
> > Any suggestions?
> 
> I don't understand this patch. Does it solve any exsiting problem?
> Why sha1_file_exist() will fail? Every object will have a unquie sha1 as
> before after stored into farm.

Farm stores only sliced objects, no?  sd_read_object_sha1() calculates
a sha1 digest against a whole object (not sliced data).

Thanks,

Kazutaka