[ https://issues.apache.org/jira/browse/LUCENE-1690?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Richard Marr updated LUCENE-1690: --------------------------------- Attachment: LruCache.patch Attached is a draft of an implementation that uses a WeakHashMap to bind the cache to the IndexReader instance, and a LinkedHashMap to provide LRU functionality. Disclaimer: I'm not fluent in Java or OSS contribution so there may be holes or bad style in this implementation. I also need to check it meets the project coding standards. Anybody up for giving me some feedback in the meantime? > Morelikethis queries are very slow compared to other search types > ----------------------------------------------------------------- > > Key: LUCENE-1690 > URL: https://issues.apache.org/jira/browse/LUCENE-1690 > Project: Lucene - Java > Issue Type: Improvement > Components: contrib/* > Affects Versions: 2.4.1 > Reporter: Richard Marr > Priority: Minor > Attachments: LruCache.patch, LUCENE-1690.patch > > Original Estimate: 2h > Remaining Estimate: 2h > > The MoreLikeThis object performs term frequency lookups for every query. > From my testing that's what seems to take up the majority of time for > MoreLikeThis searches. > For some (I'd venture many) applications it's not necessary for term > statistics to be looked up every time. A fairly naive opt-in caching > mechanism tied to the life of the MoreLikeThis object would allow > applications to cache term statistics for the duration that suits them. > I've got this working in my test code. I'll put together a patch file when I > get a minute. From my testing this can improve performance by a factor of > around 10. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online. --------------------------------------------------------------------- To unsubscribe, e-mail: java-dev-unsubscr...@lucene.apache.org For additional commands, e-mail: java-dev-h...@lucene.apache.org