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From Dan Armbrust <>
Subject Re: IndexWriter.addIndexes & optimization
Date Wed, 07 Jun 2006 20:05:49 GMT
Benjamin Stein wrote:

> I could probably store the little RAMDirectories to disk as many
> FSDirectories, and then addIndexes() of *all* the FSDirectories at the end
> instead of every time.  That would probably be smart.
> Glad I asked myself!

That was what I was going to suggest - you may also want to benchmark to 
see if the RAMDirectory is buying you anything.  With the data that I am 
indexing on my hardware, I found it to be faster to index to a regular 
FSDirectory that it is to use the RAMDirectory.  Especially if you tweak 
the performance knobs on the indexer so it does its own caching before 
it writes to the Directory.

I do batches of documents to FSDirectories - and then merge all of the 
FSDirectories into a new master index at the end - so I never have to 
optimize during the indexing process.


Daniel Armbrust
Biomedical Informatics
Mayo Clinic Rochester

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