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 <a...@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! >
