mirror of
https://github.com/apache/lucene.git
synced 2025-02-08 19:15:06 +00:00
a779a64d7b
I was looking at some queries where Lucene performs significantly worse than Tantivy at https://tantivy-search.github.io/bench/, and found out that we get quite some overhead from implementing `BooleanScorer` on top of `BulkScorer` (effectively implemented by `DefaultBulkScorer` since it only runs term queries as boolean clauses) rather than `Scorer` directly. The `CountOrHighHigh` and `CountOrHighMed` tasks are a bit noisy on my machine, so I did 3 runs on wikibigall, and all of them had speedups for these two tasks, often with a very low p-value. In theory, this change could make things slower when the inner query has a specialized bulk scorer, such as `MatchAllDocsQuery` or a conjunction. It does feel right to optimize for term queries though.
Apache Lucene
Apache Lucene is a high-performance, full-featured text search engine library written in Java.
Online Documentation
This README file only contains basic setup instructions. For more comprehensive documentation, visit:
- Latest Releases: https://lucene.apache.org/core/documentation.html
- Nightly: https://ci-builds.apache.org/job/Lucene/job/Lucene-Artifacts-main/javadoc/
- New contributors should start by reading Contributing Guide
- Build System Documentation: help/
- Migration Guide: lucene/MIGRATE.md
Building
Basic steps:
- Install OpenJDK 21.
- Clone Lucene's git repository (or download the source distribution).
- Run gradle launcher script (
gradlew).
We'll assume that you know how to get and set up the JDK - if you don't, then we suggest starting at https://jdk.java.net/ and learning more about Java, before returning to this README.
Contributing
Bug fixes, improvements and new features are always welcome! Please review the Contributing to Lucene Guide for information on contributing.
- Additional Developer Documentation: dev-docs/
Discussion and Support
- Users Mailing List
- Developers Mailing List
- IRC:
#luceneand#lucene-devon freenode.net