On Sat, 2017-09-02 at 18:33 -0700, Peilin Yang wrote: > we're comparing two different indexes on the same collection - one > with lots of different segments (default settings), and one with a > force merged into one segment. It seems that search is sometimes > faster with multiple segments.
If you are using Lucene 7+ and if some of the fields you are requesting as part of your search result are stored as DocValues, you might have encountered a performance regression with the streaming API: https://issues.apache.org/jira/browse/LUCENE-8374 One peculiar effect of this issue is that fewer larger segments gets slower DocValues retrieval, compared to more smaller segments. So a force merge to 1 segment can result in worse performance. - Toke Eskildsen, the Royal Danish Library, Denmark --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
