What are the recommended best practices for using FSDirectory vs. RamDirectory, etc. for use in multi-threaded search?
In a previous version of Lucene.Net (1.9) I used a modified FSDirectory implementation which used a pool of open FileStream objects for each segment file, and handed them out in round-robin fashion from the Clone() method. That way multiple threads could read most segment files in parallel. It definitely increased multithreaded search performance quite a bit. My indexes are quite large (100+ million docs) and I can not load entire segments in to RAM using RamDirectory. My question is what is the best practice here? Is using a pool of descriptors as described above the best idea? Thanks Bob
