Congrats! On Thu, Mar 14, 2019 at 3:49 PM Ralf Heyde <ralf.he...@gmx.de> wrote:
> Congratulations! > > Von meinem iPhone gesendet > > > Am 14.03.2019 um 13:15 schrieb jim ferenczi <jim.feren...@gmail.com>: > > > > 14 March 2019, Apache Lucene™ 8.0.0 available > > > > The Lucene PMC is pleased to announce the release of Apache Lucene 8.0.0. > > > > Apache Lucene is a high-performance, full-featured text search engine > > library written entirely in Java. It is a technology suitable for nearly > > any application that requires full-text search, especially > cross-platform. > > > > This release contains numerous bug fixes, optimizations, and > improvements, > > some of which are highlighted below. The release is available for > immediate > > download at: > > > > http://lucene.apache.org/core/mirrors-core-latest-redir.html > > > > Lucene 8.0.0 Release Highlights: > > > > Query execution > > Term queries, phrase queries and boolean queries introduced new > > optimization that enables efficient skipping over non-competitive > documents > > when the total hit count is not needed. Depending on the exact query and > > data distribution, queries might run between a few percents slower and > many > > times faster, especially term queries and pure disjunctions. > > In order to support this enhancement, some API changes have been made: > > * TopDocs.totalHits is no longer a long but an object that gives a lower > > bound of the actual hit count. > > * IndexSearcher's search and searchAfter methods now only compute total > > hit counts accurately up to 1,000 in order to enable this optimization by > > default. > > * Queries are now required to produce non-negative scores. > > > > Codecs > > * Postings now index score impacts alongside skip data. This is how term > > queries optimize collection of top hits when hit counts are not needed. > > * Doc values introduced jump tables, so that advancing runs in constant > > time. This is especially helpful on sparse fields. > > * The terms index FST is now loaded off-heap for non-primary-key fields > > using MMapDirectory, reducing heap usage for such fields. > > > > Custom scoring > > The new FeatureField allows efficient integration of static features such > > as a pagerank into the score. Furthermore, the new > > LongPoint#newDistanceFeatureQuery and LatLonPoint#newDistanceFeatureQuery > > methods allow boosting by recency and geo-distance respectively. These > new > > helpers are optimized for the case when total hit counts are not needed. > > For instance if the pagerank has a significant weight in your scores, > then > > Lucene might be able to skip over documents that have a low pagerank > value. > > > > Further details of changes are available in the change log available at: > > http://lucene.apache.org/core/8_0_0/changes/Changes.html > > > > Please report any feedback to the mailing lists ( > > http://lucene.apache.org/core/discussion.html) > > > > Note: The Apache Software Foundation uses an extensive mirroring network > > for distributing releases. It is possible that the mirror you are using > may > > not have replicated the release yet. If that is the case, please try > > another mirror. This also applies to Maven access. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > >
