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Subject: How to re-open the IndexSearcher's IndexReader
Date: Thu, 10 May 2007 22:32:32 -0700
Message-ID: 
 <3FB08D6A21B3EC4D8749EF6D9E626278012E5DB7@WDCCPMAIL01.markettools.com>
Thread-Topic: How to re-open the IndexSearcher's IndexReader
Thread-Index: AceTjcXzGiGqrfEBTmOSbQvKZ2tL7w==
From: "Andreas Guther" <Andreas.Guther@markettools.com>
To: <java-user@lucene.apache.org>


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.
   *=20
   * @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


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