Re: [PATCH v1] CLD replication (WIP)

[Jeff Garzik <jeff@garzik.org>]

Jeff Garzik wrote:
> Sage Weil wrote:
>> Hi Jeff,
>>
>> Do you still plan to replace bdb (and it's replication) with a 
>> something based on paxos?  I'm considering replacing the Ceph monitors 
>> (which currently implement paxos, but in a very ceph-specific way) 
>> with cld if it can meet the basic requirements.
>>
>> What I'd kind of like to see is a clean implementation of a paxos 
>> library--one that leaves out message transport and storage--to build a 
>> replicated write-ahead log.  And then a separate library for handling 
>> the database/namespace served up by cld (be it regular files, bdb, 
>> whatever) that leaves replication up to paxos.  It looks like Google 
>> ended up doing something similar with Chubby (see 
>> http://labs.google.com/papers/paxos_made_live.html).
>>
>> Does this sound like the direction you guys are heading in?
> 
> You mean something like http://linux.yyz.us/misc/paxreg.c  ?   :)

Oh, and the paper related to this is "The Paxos Register",
http://www.cs.utexas.edu/~harry/papers/Li07Paxos.pdf

	Jeff