This might be of some help:
I am not sure if Solr/Lucene has the implementation part done or thats just the design doc.
On Sep 15, 2011, at 5:24 PM, Uday Subbarayan wrote:
> Hey Guys,
> Any one used ZK for Database sharding? I am thinking something like this-
> -DB shard info is kept in ZK
> -Application makes the call to ZK first to get the shard info (which database server has what data)
> -Then application connects to right DB for accessing data.
> -Any shard change is communicated to the app with ZK watch.
> I see that Rackspace use case and just checking the community for anyone done it...