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Apache Lucene open-source search software
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Luca Cavanna f559cac755
Shared executor for LuceneTestCase#newSearcher callers (#12588) 
Until now, LuceneTestCase#newSearcher randomly associates the returned
IndexSearcher instance with an executor that is ad-hoc created, which
gets shut down when the index reader is closed.

This has made us catch a couple of cases where we were not properly
closing readers in tests. Most recently, we have been seeing test
failures (OOM - unable to create thread) due to too many executor
instances created as part of the same test. This is to be attributed to
creating too many searcher instance, each one getting its separate
executor, which all get shutdown at the end of the entire suite. The
main offender for this is QueryUtils which creates a new searcher for
each leaf reader, and the top-level reader gets closed in the
AfterClass, hence all the executors will stay around for the entire
duration of the test suite that relies on QueryUtils.

This commit eagerly creates an executor in an additional before class
method for LuceneTestCase, and associates that with each searcher that
is supposed to get a non null executor.

Note that the executor is shutdown in the after class to ensure that
no threads leak in tests.

This has the additional advantage that it removes the need to close the
executor as part of an index reader close listener, which also requires
the reader to have an associated reader cache helper.
 		2023-09-25 17:00:59 +02:00
.github Generate gradle.properties from gradlew (#12131) 2023-02-06 19:47:15 +01:00
buildSrc Implement MMapDirectory with Java 21 Project Panama Preview API (#12294) 2023-06-12 21:07:04 +02:00
dev-docs a bit of clarification about GitHub Milestone 2022-08-28 13:52:58 +09:00
dev-tools DOAP changes for release 9.7.0 2023-06-26 11:05:46 +02:00
gradle Resolve CompileJava task cache miss (#12577) 2023-09-21 10:42:20 +02:00
help Generate gradle.properties from gradlew (#12131) 2023-02-06 19:47:15 +01:00
lucene Shared executor for LuceneTestCase#newSearcher callers (#12588) 2023-09-25 17:00:59 +02:00
.asf.yaml .asf.yaml 2022-08-16 20:02:47 +09:00
.dir-locals.el LUCENE-9322: Add Lucene90 codec, including VectorFormat 2020-10-18 07:49:36 -04:00
.git-blame-ignore-revs LUCENE-9570: code reformatting [record rev]. 2021-01-05 13:44:42 +01:00
.gitattributes LUCENE-10305: Ensure line endings of versions.props is LF 2021-12-11 10:10:44 +09:00
.gitignore LUCENE-9920: Remove binary gradle-wrapper.jar from the repository 2021-04-10 16:08:39 +02:00
.hgignore LUCENE-2792: add FST impl 2010-12-12 15:36:08 +00:00
.lift.toml Disable liftbot, we have our own tools 2022-05-05 22:27:57 +02:00
CONTRIBUTING.md Fix type in CONTRIBUTING.md (#11879) 2022-11-01 20:10:05 +00:00
LICENSE.txt LUCENE-10163 Move LICENSE and NOTICE file to top level (#388) 2021-10-18 01:24:11 +02:00
NOTICE.txt Cleanup NOTICE.txt (#12227) 2023-04-18 15:58:09 -04:00
README.md Allow building with java 18 now that gradle supports it (#11889) 2022-10-28 23:41:09 -04:00
build.gradle Integrate the Incubating Panama Vector API (#12311) 2023-05-25 07:59:50 +01:00
gradlew Generate gradle.properties from gradlew (#12131) 2023-02-06 19:47:15 +01:00
gradlew.bat Generate gradle.properties from gradlew (#12131) 2023-02-06 19:47:15 +01:00
settings.gradle GH-11172: remove WindowsDirectory and native subproject. (#11774) 2022-09-15 16:22:46 +02:00
versions.lock remove non-NRT replication support (#12038) 2023-01-14 11:14:46 -05:00
versions.props Upgrade to errorprone 2.18 (#12086) 2023-01-14 14:39:23 -05:00

README.md

Apache Lucene

Lucene Logo

Apache Lucene is a high-performance, full-featured text search engine library written in Java.

Build Status

Online Documentation

This README file only contains basic setup instructions. For more comprehensive documentation, visit:

Building

Basic steps:

  1. Install OpenJDK 17 or 18.
  2. Clone Lucene's git repository (or download the source distribution).
  3. 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