Re: PGBackend: Multiple PG implementations.

[Loic Dachary <loic@dachary.org>]

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Hi Lluís,

David Zafman and Samuel Just are working to re-architecture the core of Ceph so that and ErasureCodedBackend can be implemented. You can browse their commits to see what they are up to. The transcript of the last CDS summit will also give you a general view of the direction in which it is heading : 

http://wiki.ceph.com/01Planning/CDS/Emperor/Transcript_:_Erasure_coded_storage_backend_%28step_2%29

and a more recent interview of Samuel Just will give you a short update :

http://dachary.org/?p=2320

I'm not the best qualified to comment on the generic part of your patches, but I think it overlaps with the work being done.

Cheers

On 19/10/2013 01:05, Lluís Pàmies i Juárez wrote:
> Hello,
> 
> I was looking at the work done to re-architecture the OSD backend.
> Since it seems that it allows now to have more than one PG
> implementation I decided to subclass PG and PGBackend to create an
> alternative implementation to ReplicatedPG and ReplicatedBackend.
> However, I noticed a couple of problems:
> 
> * All methods in watch.h and watch.cc expect ReplicatedPG objects
> instead of generic PG objects.
> * New pools created in the OSDMonitor are created as replicated pools
> (g_pool_t::TYPE_REP). This is a hardcoded value.
> 
> I made a few changes to solve these two issues that allowed me to have
> more than one PG implementation running without problems. You can find
> the changes here:
> 
> https://github.com/ceph/ceph/pull/744
> 
> Are these changes useful for the re-architecture of the OSD ?
> 
> PS: Implementing and running an alternative PG requires other changes
> in the CrushCompiler and other header files.
> 
> Best,
> Lluis
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-- 
Loïc Dachary, Artisan Logiciel Libre
All that is necessary for the triumph of evil is that good people do nothing.


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