Unless you have hard evidence that FSDirectories are too slow, you shouldn't IMO. The only place I've found RAMDirectories useful (so far) is in unit tests where I'm creating a very small in-memory index, running a few tests, and throwing it away.
My first question for this is "why are you using a RAMDirectory in the first place?" Lucene does it's own caching etc, so it tries to use RAM efficiently for you. Do you have any evidence that using the normal FSDirectory is inadequate? If not, I recommend that you simply go back to FSDirectory and worry about refinements if and only if the performance is demonstrably inadequate. Do be aware, when getting performance numbers, that the first few queries of an FS-based index will take extra time to build up the cache. Particularly the first few sorts you do. If you have hard evidence, perhaps you could post some data that would give us a clue what the size of your problem is. How big is your index? How is it structured? What performance numbers are you seeing? For what kind of queries? Best Erick On 5/26/07, Walter Ferrara <[EMAIL PROTECTED]> wrote:
I have an index on the disk. I'm using RAMDirectory( String ) to load index in RAM. I need from time to time to reload the index (when it is not current anymore), but I keep getting Out Of memory exception. Making the jvm heap bigger helps, but only allow more reloading, eventually it will throw the exception. I just make a IndexSearcher. I've noticed that when I use that searcher I get the exception, instead while I do not search on the searcher I get no exception. The exception in throw while istancing the RAMDirectory. I do not make any sort. I do close the searcher. I do even close searcher.getIndexReader().directory().close(). It is like that, when indexserver is used, some references still survive and ram directory is not freed. How should I use the RAMDirectory? It is something related to the SingleInstanceLockFactory <../../../../org/apache/lucene/store/SingleInstanceLockFactory.html>? Can I have 2 ramdirectory, or try to use the same one by putting in it, with copy maybe, the index I have on disk? thanks, -- Walter --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
