From the website:
Solandra is a real-time distributed search engine built on Apache Solr and Apache Cassandra.
At its core Solandra is a tight integration of Solr and Cassandra, meaning within a single JVM both Solr and Cassandra are running, and documents are stored and disributed using Cassandra’s data model.
Solandra makes managing and dynamically growing Solr simple(r).
See the Solandra wiki for more details.
The more searching that occurs across diverse data sets, the more evident the use case(s) for topic maps will become.
Will you be there to answer the call?