Re: Erasure Code Plugins : PLUGINS_V3 feature

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On Wed, 5 Aug 2015, Loic Dachary wrote:
> Hi Sam,
> 
> How does this proposal sound ? It would be great if that was done before 
> the feature freeze.

I think it's a good time.

Takeshi, note that what this really means is that the on-disk encoding 
needs to remain fixed.  If we decide to change it down the line, we'll 
have to make a 'shec2' or similar so that the old format is still 
decodable (or ensure that existing data can still be read in some other 
way).

Sound good?

sage


> 
> Cheers
> 
> On 29/07/2015 11:16, Loic Dachary wrote:
> > Hi Sam,
> > 
> > The SHEC plugin[0] has been running in the rados runs[1] in the past few months. It also has a matching corpus verification which runs on every make check[2] as well as its optimized variants. I believe the flag "experimental" can now be removed. 
> > 
> > In order to do so, we need to use a PLUGINS_V3 feature, in the same way we did back in Giant when the ISA and LRC plugins were introduced[3]. This won't be necessary in the future, when there is a generic plugin mechanism, but right now that's what we need. It would be a commit very similar to the one implementing PLUGINS_V2[4].
> > 
> > Is this agreeable to you ? Or would you rather see another way to resolve this ?
> > 
> > Cheers
> > 
> > [0] https://github.com/ceph/ceph/tree/master/src/erasure-code/shec
> > [1] https://github.com/ceph/ceph-qa-suite/tree/master/suites/rados/thrash-erasure-code-shec
> > [2] https://github.com/ceph/ceph-erasure-code-corpus/blob/master/v0.92-988/non-regression.sh#L52
> > [3] http://tracker.ceph.com/issues/9343
> > [4] https://github.com/ceph/ceph/commit/9687150ceac9cc7e506bc227f430d4207a6d7489
> > 
> 
> -- 
> Loïc Dachary, Artisan Logiciel Libre
> 
> 

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