You should take a look at what DataStax has already done with Solr and Cassandra.
http://www.datastax.com/dev/blog/cassandra-with-solr-integration-details wunder On May 24, 2012, at 7:50 AM, Nicholas Ball wrote: > > Hey all, > > I've been working on a SOLR set up with some heavy customization (using > the adminHandler as a way into the system) for a research project @ > Imperial College London, however I now see there has been a substantial > push towards a NoSQL. For this, there needs to be some kind of optimistic > fine-grained concurrency control on updates. As we have document versioning > in-built into Lucene (and therefore Solr) this shouldn't be too difficult, > however the push has been more of a focus on single core optimistic > LOCKING. > > I would like to take this toward a multi-core (and multi-node) distributed > optimistic lock-free mechanism. This is gives us the ability to provide > stronger guarantees than NoSQL wrt distributed transaction isolation and as > we can now do soft-commits, we can also provide specific version rollbacks > (http://java.dzone.com/articles/exploring-transactional-0). Some more > interesting reading on this topic: (read-)snapshot isolation > (http://pages.cs.wisc.edu/~cs764-1/critique.pdf) and even stronger > guarantees with a slight performance hit with write-snapshot isolation > (http://www.fever.ch/usbkey_eurosys12/papers/p155-yabandehA.pdf). People > are starting to realize that we don't have to sacrifice guarantees for > better performance and scalability (like NoSQL) but rather relax them very > minimally. > > What I need is for someone to shed some light on this feature and the > future plans of Solr wrt this is? Am I correct in thinking that a > multiversion concurrency control (MVCC) locking mechanism now exist for a > single core or is it lock-free and multi-core? > > Many thanks, > Nicholas Ball (aka incunix) -- Walter Underwood wun...@wunderwood.org
