a9fb5a965d
In LUCENE-9002 we introduced logic to skip caching a clause if it would be too expensive compared to the usual query cost. Specifically, we avoid caching a clause if its cost is estimated to be a 250x higher than the lead iterator's. We've found that the default of 250 is quite high and can lead to poor tail latencies. This PR decreases it to 10 to cache more conservatively. |
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| .github | ||
| .muse | ||
| buildSrc | ||
| dev-docs | ||
| dev-tools | ||
| gradle | ||
| help | ||
| lucene | ||
| .asf.yaml | ||
| .dir-locals.el | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .hgignore | ||
| LICENSE | ||
| README.md | ||
| build.gradle | ||
| gradlew | ||
| gradlew.bat | ||
| settings.gradle | ||
| versions.lock | ||
| versions.props | ||
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:
Building with Gradle
Basic steps:
- Install OpenJDK 11 (or greater up until version 15)
- Download Lucene from Apache and unpack it (or clone the git repository).
- Run gradle launcher script (
gradlew).
Step 0) Set up your development environment (OpenJDK 11 or greater)
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. Lucene runs with Java 11 or later.
Lucene uses Gradle for build control. Gradle is itself Java-based and may be incompatible with newer Java versions; you can still build and test Lucene with these Java releases, see help/tests.txt for more information.
NOTE: Lucene changed from Ant to Gradle as of release 9.0. Prior releases still use Ant.
Step 1) Checkout/Download Lucene source code
You can clone the source code from GitHub:
https://github.com/apache/lucene
or get Lucene source archives for a particular release from:
https://lucene.apache.org/core/downloads.html
Download either a zip or a tarred/gzipped version of the archive, and uncompress it into a directory of your choice.
Step 2) Run Gradle
Run "./gradlew help", this will show the main tasks that can be executed to show help sub-topics.
If you want to build Lucene, type:
./gradlew assemble
NOTE: DO NOT use gradle command that is already installed on your machine (unless you know what you'll do).
The "gradle wrapper" (gradlew) does the job - downloads the correct version of it, setups necessary configurations.
The first time you run Gradle, it will create a file "gradle.properties" that contains machine-specific settings. Normally you can use this file as-is, but it can be modified if necessary.
./gradlew check will assemble Lucene and run all validation
tasks (including unit tests).
./gradlew help will print a list of help guides that help understand how
the build and typical workflow works.
If you want to build the documentation, type:
./gradlew documentation
Gradle build and IDE support
- IntelliJ - IntelliJ idea can import the project out of the box.
- Eclipse - Basic support (help/IDEs.txt).
- Netbeans - Not tested.
Contributing
Please review the Contributing to Lucene Guide for information on contributing.
Discussion and Support
- Users Mailing List
- Developers Mailing List
- Issue Tracker
- IRC:
#luceneand#lucene-devon freenode.net