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#16709 PR: Add SegmentIVF vector codec to Lucene sandbox
35.1 minutes ago  0 comments  0 votes  0 watches  RKSPD, github-actions[bot]
SegmentIVF: a fast(er) Lucene-native inverted-file vector codec SegmentIVF is a Lucene KNN codec ... It is a further development of IVFaster 16567 with some cool new features. Before going into the implementation, it is important to describe the architectural philosophy ...

#13920: Performance difference between files getting opened with IOContext.RANDOM vs IOContext.READ during ...
3 hours ago  13 comments  0 votes  0 watches  jimczi, jmazanec15, jpountz, mikemccand, msokolov, navneet1v, s1monw, shatejas, uschindler, vamshin
# Description For past 1 month we have been testing difference in performance for a files getting ... We started this deep-dive when we saw an increase in time for our force merges. Background Opensearch k-NN plugin provides the vector search capabilities with Opensearch.
    msokolov 3 hours ago:  Thanks @jimczi, this seems much cleaner than trying to restore state
    jimczi 8.2 hours ago:  Coming back to this one after a while, since what was decided here still shapes the current code. The conclusion was to change the read advice on the already open IndexInput for the duration of a ... In 16684 we tried the other route for stored fields: the merge opens the file a second time and ...

#15287: Improvements to the Faiss codec
5.1 hours ago  4 comments  0 votes  0 watches  CH-Abhinav, kaivalnp, mikemccand, risdenk
Description Lucene added a Faiss-based vector search format in 14178, opening this issue to track ... Allow Faiss to use SIMD instructions (more context here) 2. Byte vector support (more context here) 3.
    CH-Abhinav 5.1 hours ago:  Okay. I will try to implement this set of ideas in parts so that it will be easier for everyone.
    mikemccand 5.2 hours ago:  +1, feel free! Panama SIMD experience is very welcome. I don't think anyone is working on these ideas now.

#16446 PR: MultiFieldQueryParser: default operator is not honored between term positions (#16443)
5.1 hours ago  33 comments  0 votes  0 watches  Copilot, OlivierJaquemet, copilot-pull-request-reviewer[bot], epotyom, github-actions[bot], mkhludnev
Fixes 16443 **Problem:** MultiFieldQueryParser's javadoc promises that under AND_OPERATOR, "all ... This only holds when each term reaches the parser as a separate grammar-level token (real ... It doesn't hold when several terms are produced by the *analyzer alone* from a single piece of ...
    copilot-pull-request-reviewer[bot] 5.1 hours ago:  Copilot was unable to review this pull request because the user who requested the review has ...
    OlivierJaquemet 5.4 hours ago:  @epotyom, as discussed, I've closed the other PR and reached out to the dev mailing list to request ... Thanks again for your help and for taking the time to review this!

#14243: Support Vector Search on GPU with cuVS
5.9 hours ago  4 comments  0 votes  0 watches  CH-Abhinav, ChrisHegarty, Edarke, alessandrobenedetti, chatman, cjnolet, exceedzhang, julianmi, narangvivek10, punAhuja, tomc603, weizijun, zacksiri
Description * NVIDIA's cuVS library (https://github.com/rapidsai/cuvs) is a state-of-the-art ... It supports fast indexing and search using GPUs. * cuVS will provide a java api in 25.02 : https:// ... Image# Tasks: - [x] TestCuVS works via IDE, but not via gradle ~(some native access security ...
    CH-Abhinav 5.9 hours ago:  @chatman hey I am new to lucene's old and saw this issue and it's PR. did you guys add cuVS features you guys are talking about ?
    chatman 1.2 years ago:  @zacksiri @weizijun I've closed the existing PR, currently working on some fundamental changes ... If you wish to track our intermediate progress more closely or just need a place to discuss with us ... Thanks a lot, and looking forward to having this done soon!

#16715 PR: Use unbounded lead cost for prohibited clauses
6.2 hours ago  1 comments  0 votes  0 watches  github-actions[bot], kkewwei
Description BooleanScorerSupplierbulkScorer used the positive scorer's cost as the lead cost for ... For an IndexOrDocValuesQuery , this could incorrectly select the doc-values implementation even ... This change uses an unbounded lead cost for prohibited clauses, allowing IndexOrDocValuesQuery to ...
    kkewwei 6.3 hours ago:  Since there was no existing task covering this case, I addedMostNotIODVRange. https://github.com/mikemccand/luceneutil/compare/main...kkewwei:must_not_task?expand=1 I added a benchmark task set in luceneutil with wikimediumall, it shows an ...

#16684 PR: Let merges read stored fields sequentially without disturbing searches
8.2 hours ago  8 comments  0 votes  0 watches  github-actions[bot], jimczi, uschindler
A merge reads stored fields front to back, while searches read the same file at random. ... Asking for them in place is not an option, since read advice applies to a whole mapping and ... So a merge opens the data file for itself with DataAccessHint.SEQUENTIAL, and searches keep the ...
    jimczi 8.2 hours ago:  Thanks for digging into it, we ended up at the same conclusion on our side. On the file handles you raised, I tried to mitigate it by closing earlier. StoredFieldsReader now gets the finishMerge hook that KnnVectorsReader already has, called from ...
    uschindler 9.6 hours ago:  To me this reads: It should be fine to have multiple mappings with different madvise. If a page is in cache already it won't affect anything (it just reads from cache). But if one of the call paths cause a page fault, the "handling of that page fault" is done using ...

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