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From Sylvain Lebresne <sylv...@datastax.com>
Subject Re: Where is my data?
Date Wed, 15 Jun 2011 09:20:31 GMT
You can use the thrift call describe_ring(). It will returns a map
that associate to each range of the
ring who is a replica. Once any range has all it's endpoint
unavailable, that range of the data is unavailable.

--
Sylvain

On Tue, Jun 14, 2011 at 11:33 PM, AJ <aj@dude.podzone.net> wrote:
> Is there an official deterministic formula to compute the various subsets of
> a given cluster that comprises a complete set of data (redundant rows ok)?
>  IOW, if multiple nodes become unavailable one at a time, at what point can
> I say <100% of my data is available?
>
> Obviously, the method would have to take into consideration the ring layout
> along with the partition type, the # of nodes, replication_factor,
> replication strat, etc..
>
> Thanks!
>

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