Indexer large file and hi performance indexing

["HODAC, Olivier" <ol...@airbus.com>]

hello,

I design an application which bottleneck concerns the indexing process. Objects indexation blocks the user's action. Furthermore, I need to index a large maount of documents (30000 per day) and save them on the file system.

The first developments have been initiate with lucene 1.4.3 and I had to create a cachedIndexer which uses a RAMDirectory and a FS directory. For the searches, the cached indexer searches in RAM and FS indexes. For deletion, the delete is done in the RAM and FS.

Each N documents to index in the cache (RAMDirectory), a thread dumps them to the FSDirectory, with a synchronize.

In 1 month, I reached an index cfs file of 2.5Go, and the merge process (addIndexes) takes 5 minutes approx (solaris 5.9).!!!! => synchronize...

Questions:
* Is it a good way of doing things? 
* Does maxMergeDocs is a solution for the merge process to be lower?
* If I call addIndexes on the 2.5Go index file with a maxMergeDocs, it calls optimize. the javadoc says that it calls optimize, which gathers to 1 file the indexdir. is it true whatever the maxMergeDocs?

Thanks

 
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