There’s a pretty long list of Lucene changes this week.
Combined with the changes from last week that we didn’t review, I think this week will mostly focus on changelog review.
| Version | Category | Description | Link |
|---|---|---|---|
| Lucene 10.0.0 | API Changes | Convert IOContext, MergeInfo, and FlushInfo to record classes. | https://github.com/apache/lucene/issues/13205 |
| Lucene 10.0.0 | API Changes | The `readOnce`, `load` and `random` flags on `IOContext` have been replaced with a new `ReadAdvice` enum. | https://github.com/apache/lucene/issues/13219 |
| Lucene 10.0.0 | API Changes | Replace `IOContext.READ` with `IOContext.DEFAULT`. | https://github.com/apache/lucene/issues/13242 |
| Lucene 10.0.0 | New Features | Add RomanianNormalizationFilter | https://github.com/apache/lucene/issues/13233 |
| Lucene 10.0.0 | Improvements | Upgrade snowball to 26db1ab9. | https://github.com/apache/lucene/issues/13209 |
| Lucene 10.0.0 | Improvements | Update Romanian stopwords list to include the modern unicode forms. | https://github.com/apache/lucene/issues/12172 |
| Lucene 10.0.0 | Changes in Backwards Compatibility Policy | Remove the Kp and Lovins snowball algorithms which are not supported or intended for general use. | https://github.com/apache/lucene/issues/13230 |
| Lucene 9.11.0 | New Features | Add support for posix_madvise to MMapDirectory: If running on Linux/macOS and Java 21 or later, MMapDirectory uses IOContext to pass suitable MADV flags to kernel of operating system. This may improve paging logic especially when large segments are merged under memory pressure. | https://github.com/apache/lucene/issues/13196 |
| Lucene 9.11.0 | Optimizations | Speed up dynamic pruning by breaking point estimation when threshold get exceeded. | https://github.com/apache/lucene/issues/13199 |
| Lucene 9.11.0 | Optimizations | Speed up writeGroupVInts | https://github.com/apache/lucene/issues/13203 |
| Lucene 9.11.0 | Optimizations | Use singleton for all-zeros DirectMonotonicReader.Meta | https://github.com/apache/lucene/issues/13224 |
| Lucene 9.11.0 | Optimizations | Introduce singleton for PackedInts.NullReader of size 256 | https://github.com/apache/lucene/issues/13232 |
| Lucene 9.11.0 | Optimizations | Binary search the BlockTree terms dictionary entries when all suffixes have the same length in a leaf block, speeding up cases like primary key lookup on an id field when all ids are the same length. | https://github.com/apache/lucene/issues/11888 |
| Lucene 9.11.0 | Bug Fixes | Subtract deleted file size from the cache size of NRTCachingDirectory. | https://github.com/apache/lucene/issues/13206 |