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apache / lucene / a51241e4c94555a10a76cf01507b4d0a5db52542
commita51241e4c94555a10a76cf01507b4d0a5db52542[log] [tgz]
authorAlan Woodward <romseygeek@apache.org>Fri Jun 09 11:57:59 2023 +0100
committerGitHub <noreply@github.com>Fri Jun 09 11:57:59 2023 +0100
tree3f2ecb59657ace07b54823fba38f489a0d2727b2
parent2934899ca67829b4882e52a3264374477308201d [diff]
Better paging when random reads go backwards (#12357)

When reading data from outside the buffer, BufferedIndexInput always resets
its buffer to start at the new read position. If we are reading backwards (for example,
using an OffHeapFSTStore for a terms dictionary) then this can have the effect of
re-reading the same data over and over again.

This commit changes BufferedIndexInput to use paging when reading backwards,
so that if we ask for a byte that is before the current buffer, we read a block of data
of bufferSize that ends at the previous buffer start.

Fixes #12356
3 files changed
tree: 3f2ecb59657ace07b54823fba38f489a0d2727b2
  1. .github/
  2. buildSrc/
  3. dev-docs/
  4. dev-tools/
  5. gradle/
  6. help/
  7. lucene/
  8. .asf.yaml
  9. .dir-locals.el
  10. .git-blame-ignore-revs
  11. .gitattributes
  12. .gitignore
  13. .hgignore
  14. .lift.toml
  15. build.gradle
  16. CONTRIBUTING.md
  17. gradlew
  18. gradlew.bat
  19. LICENSE.txt
  20. NOTICE.txt
  21. README.md
  22. settings.gradle
  23. versions.lock
  24. versions.props
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