AFAIk if you want to keep it inside cassandra then DSE, roll your own from scratch or start with https://github.com/tjake/Solandra . 

Outside of Cassandra I've heard of people using Elastic Search or Solr which I *think* is now faster at updating the index. 

Hope that helps. 

 
-----------------
Aaron Morton
Freelance Developer
@aaronmorton

On 4/09/2012, at 3:00 AM, Andrey V. Panov <panov.andy@gmail.com> wrote:

Some one did search on Lucene, but for very fresh data they build search index in memory so data become available for search without delays.

On 3 September 2012 22:25, Oleg Dulin <oleg.dulin@gmail.com> wrote:
Dear Distinguished Colleagues: