As far as I know, you have to open a new instance. I don't think this is solved in Lucene 2.1 at all.
I do remember discussions a while ago where the general idea was to open a new reader and, perhaps, fire a few "primer" queries at it on some background thread. Then, your main thread can switch to the new one. Of course, you have to do some fancy-dancing to coordinate all of the threads using that searcher... Solr has been mentioned as having solved this problem. But I haven't looked at it myself. WARNING: Our applications haven't had to worry about this, so I'm not speaking from actual experience. Erick On 5/11/07, Andreas Guther <[EMAIL PROTECTED]> wrote:
Maybe I should add that I am currently using Lucene 2.0. From other threads I get the impression that this might be solved in Lucene 2.1. -----Original Message----- From: Andreas Guther [mailto:[EMAIL PROTECTED] Sent: Thursday, May 10, 2007 10:33 PM To: java-user@lucene.apache.org Subject: How to re-open the IndexSearcher's IndexReader Hi, How can I re-use an IndexSearcher and keep track of changes to the index? I am dealing with Index Directories of several GB. Opening and IndexSearcher is very expensive and can take several seconds. Therefore I am caching the IndexSearcher for re-use. Our indexes are frequently updated. Before I pass the IndexSearcher retrieved from the cache I use the IndexSearcher getIndexReader() method to get the IndexReader and to check if the IndexReader is current (via the isCurrent() method). The isCurrent method is documented as follows: /** * Check whether this IndexReader still works on a current version of the index. * If this is not the case you will need to re-open the IndexReader to * make sure you see the latest changes made to the index. * * @throws IOException */ Opening a new IndexReader is trivial. But then how do I set the IndexSearcher's reader to the new one without getting a new instance? Thanks in advance for any help. Andreas --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
