mirror of
https://github.com/apache/lucene.git
synced 2025-02-10 12:05:36 +00:00
79fd9fee97
Advancing within a block consists of finding the first index within an array of 128 values whose value is greater than or equal a target. Given the small size, it's not obvious whether it's better to perform a linear search, a binary search or something else... It is surprisingly hard to beat the linear search that we are using today. Experiments suggested that the following approach works in practice: - First check if the next item in the array is greater than or equal to the target. - Then find the first 4-values interval that contains our target. - Then perform a branchless binary search within this interval of 4 values. This approach still biases heavily towards the case when the target is very close to the current index, only a bit less than a linear search.
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