On Mon, 01 Mar 2004 12:24:26 +0100, Michael Steiger said:
1. Concurrency of IndexWriter and IndexReader It seems that it is not allowed to open an IndexWriter and an IndexReader at the same time. But if one user is changing records in the database (and therefore changing documents in the Lucene index) and another user is querying the index, I would need to open them both.
Not necessarily so. Shouldn't you be using an IndexSearcher to query the index instead of an IndexReader? IndexReader should be used primarily for deleting and low-level document retrieval via Terms.
I am using an IndexSearcher for querying the index but for deletions I need to use the IndexReader. I now know that I can have Readers and a Writer open concurrently but IndexReader.delete can only be used if no Writer is open.
2. Optimizing the index This is maybe related to my first issue. I assume that while optimizing the index no queries are allowed. How often should the index be optimized?
Again, IndexSearcher has no problem with the index being modified (via optimizing, or otherwise) whilst searching. However, you'll need to have some way of refreshing your IndexSearcher when this happens, otherwise the IndexSearcher would be obsolete.
I want to open the IndexSearcher only while searching and close it afterwards.
Thanks Michael
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