Basho folks, Any answer to these questions?
On Mon, Dec 12, 2011 at 9:52 AM, Elias Levy <[email protected]>wrote: > I went through the bug database and could not find any open ticket for > having a configurable r-value in mapreduce. Is there one that someone > knows of? > > It would seem like this is a major limitation of the system. Currently MR > works in a way that essentially results in an R-value of 1. That makes MR > unreliable if you loose a node or add new nodes to your cluster. This is > particularly painful, as MR is often used in lieu for a bulk fetch API, or > when combined with Search or 2i to remove the additional round trip time > that would be required without it. > > We'd like to double the size of our cluster, but without dumping all of > the data and reloading it after we'd added the the new nodes, which would > take far too long even with the new nodes (bulk load API anyone?), this > does not seem feasible. It would result in 50% found found errors. Even > adding a single node seems unacceptable. > > How are people handling this? Can one use Riak EDS to mirror the data to > the new nodes set up as in a mirrored cluster, and once they are up to > data, add them to the production cluster? Or is there a way to add a node > to a cluster in such way that it accepts data for storage but not for > querying, then have Riak EDS populate it, and then have it start accepting > reads? > > Elias Levy >
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