mirror of https://github.com/apache/lucene.git
3003731aa9
This adds `IndexInput#prefetch`, which is an optional operation that instructs the `IndexInput` to start fetching bytes from storage in the background. These bytes will be picked up by follow-up calls to the `IndexInput#readXXX` methods. In the future, this will help Lucene move from a maximum of one I/O operation per search thread to one I/O operation per search thread per `IndexInput`. Typically, when running a query on two terms, the I/O into the terms dictionary is sequential today. In the future, we would ideally do these I/Os in parallel using this new API. Note that this will require API changes to some classes including `TermsEnum`. I settled on this API because it's simple and wouldn't require making all Lucene APIs asynchronous to take advantage of extra I/O concurrency, which I worry would make the query evaluation logic too complicated. This change will require follow-ups to start using this new API when working with terms dictionaries, postings, etc. Relates #13179 Co-authored-by: Uwe Schindler <uschindler@apache.org> |
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README.md
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/
- Build System Documentation: help/
- Developer Documentation: dev-docs/
- 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.
See Contributing Guide for details.
Contributing
Bug fixes, improvements and new features are always welcome! Please review the Contributing to Lucene Guide for information on contributing.
Discussion and Support
- Users Mailing List
- Developers Mailing List
- IRC:
#luceneand#lucene-devon freenode.net