Can anyone provide a simple comparative analysis of these search engines? What advantages does either framework have?
BTW, I've seen the following basic explanations of choosing mg4j from several academic papers:
- combining indices over the same collection
- multi-index queries
Update:
These slides (from mir2ed.org) contain a more fresh overview of open source search engines including Lucene and mg4j on benchmarking various aspects: memory & CPU, index size, search performance, search quality etc.