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Earwin Burrfoot commented on LUCENE-3105: ----------------------------------------- Hmm.. Ok, it *is* still used, but that's gonna be fixed, mm? > String.intern() calls slow down IndexWriter.close() and IndexReader.open() > for index with large number of unique field names > ---------------------------------------------------------------------------------------------------------------------------- > > Key: LUCENE-3105 > URL: https://issues.apache.org/jira/browse/LUCENE-3105 > Project: Lucene - Java > Issue Type: Bug > Components: core/index > Affects Versions: 3.1 > Reporter: Mark Kristensson > Attachments: LUCENE-3105.patch > > > We have one index with several hundred thousand unqiue field names (we're > optimistic that Lucene 4.0 is flexible enough to allow us to change our index > design...) and found that opening an index writer and closing an index reader > results in horribly slow performance on that one index. I have isolated the > problem down to the calls to String.intern() that are used to allow for quick > string comparisons of field names throughout Lucene. These String.intern() > calls are unnecessary and can be replaced with a hashmap lookup. In fact, > StringHelper.java has its own hashmap implementation that it uses in > conjunction with String.intern(). Rather than using a one-off hashmap, I've > elected to use a ConcurrentHashMap in this patch. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org