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#16693 PR: Prevent unintended multi-segment flushes in TestLucene104ScalarQuantizedVectorFormat (#16692)
2.7 hours ago  9 comments  0 votes  0 watches  CH-Abhinavgithub-actions[bot]mccullocht
Resolves 16692 Description Follow-up to 16030: fixes test flakiness in TestLucene104ScalarQuantiz ... Under randomized test runs (e.g., seeds D9588E29B239F98E, ACA59AF04AC0B9BF, 29219F4CDF5F2122), ... IndexWriter randomly flushing multiple segments because of low randomized RAM buffers, breaking ...
    CH-Abhinav 2.8 hours ago:  I tried removing the config overrides and relying strictly on forceMerge(1) for those 5 tests, but ... I guess it is because some methods directly access via dir.listAll() files ignoring setUseCompoundFi ... At least that is what I think.
    mccullocht 23.9 hours ago:  I think you can remove all of these. I don't think the buffering options are needed, and setMergePolicy(NoMergePolicy) means that ...

#16029: Data-blind scalar quantization
3.4 hours ago  9 comments  0 votes  0 watches  Pranshu-Skaivalnpmccullochtmikemccandromseygeekshubhamvishuxande
Description Add options for data-blind scalar quantization. Data blind quantization will allow users to drop the raw float vectors which will be a significant ... There are 3 parts to this change: - [x] Allow users to disable centering and drop the raw float ...
    mccullocht 3.4 hours ago:  I merged the data blind changes (thanks @kaivalnp) with some expanded scope: you can choose whether ... We disallow dropping the float vectors for asymmetric quantization schemes (1 and 2 bit docs) ... The next step here is to optionally quantize residuals.
    mccullocht 1.1 months ago:  We had a similar discussion about rotation and centering on a PR for TurboQuant. Quantizers often perform better with a Gaussian component distribution -- RaBitQ and TurboQuant ... If you don't _need_ to be data blind, centering is still tremendously helpful.

#16699 PR: Support floats and doubles in IndexSortSortedNumericDocValuesRangeQuery
4.1 hours ago  2 comments  0 votes  0 watches  HoustonPutmangithub-actions[bot]romseygeek
Description This PR fixes 16698 and adds support for floats and double in IndexSortSortedNumericD ... FloatField and DoubleField now use IndexSortSortedNumericDocValuesRangeQuery when creating ... And IndexSortSortedNumericDocValuesRangeQuery has convenience methods for floats and doubles to ...
    HoustonPutman 4.1 hours ago:  I agree, when doing this I was really confused why this wasn't built in to the existing query ... But thought I was just missing something. I'll try to get this integrated into the actual sub queries and deprecate this class.
    romseygeek 12.1 hours ago:  Having thought about this a bit more..

#16682 PR: Let the structure reading vectors say how they are read
4.1 hours ago  12 comments  0 votes  0 watches  ChrisHegartygithub-actions[bot]jimczi
A format opening a file can attach hints to say what it holds and how it will be read, and a ... MMapDirectory turns them into madvise calls if an application asks it to. Today the vectors formats get two things wrong there.
    jimczi 4.1 hours ago:  Done, on both states.
    jimczi 4.1 hours ago:  I added this and then took it out again. Every call site passed a null access hint, so it returned the context it was given. A format that can be wrapped has no fallback to apply: whoever wraps it puts the hint on the state, ...

#16702: MUST_NOT + IndexOrDocValuesQuery: much slower on 10.x than 9.x/8.x
5.7 hours ago  4 comments  0 votes  0 watches  Abdelloxkkewweimkierus
Description While testing a migration from Elasticsearch 7.10 to OpenSearch, we noticed that a ... We first noticed this by loading the same dataset into Docker containers running each engine ... We traced this back to Lucene: IndexOrDocValuesQuery picks the doc-values side instead of the ...
    kkewwei 5.7 hours ago:  @mkierus Thanks for the detailed investigation and reproducer. I’ll pick this up and work on a fix soon.
    mkierus 5.9 hours ago:  @kkewwei Thanks for confirming, and for the offer! I don't have enough Lucene internals experience to take this on myself with confidence, so I'd ... If it helps, I'm happy to run any candidate fix against the real-world reproducer from the issue ( ...

#16696 PR: Stop reading merged float vectors back to build the HNSW merge scorer
6.1 hours ago  25 comments  0 votes  0 watches  github-actions[bot]iverasejohn-mlikathecoop
An HNSW merge over an asymmetric scalar-quantized field writes the merged float vectors, then reads ... This change produces both quantizations in one writer walk. apache/lucene#15732 stopped the merge ... DirectIODirectory in lucene/misc supports direct I/O during merges, and there the read-back is a ...
    thecoop 6.1 hours ago:  Isn't this type already known?
    thecoop 6.2 hours ago:  Is there some way to use/share what the reader does, so there's not two methods producing the same ...

#16664 PR: Speed up concurrent HNSW merge through reduced beam insertion
7 hours ago  2 comments  0 votes  0 watches  costingithub-actions[bot]mayya-sharipova
When merging HNSW graphs concurrently, every non-base vector is inserted via full beam search from ... The sequential merge path avoids this, by collecting neighborhood information as entry points to ... This PR addressed that.
    costin 7.1 days ago:  Thanks for the review. This is going to be a long answer as my understanding of the algorithm might be incomplete hence ... Now threads "steal" leftover work as (source graph, source ordinal) and look up the merged ordinal ...
    mayya-sharipova 11.3 days ago:  @costin Thanks for tackling concurrent merges. Before you invest more here: I'm not convinced by this approach. The sequential algorithm was designed around the join set, which gives two guarantees — coverage ...

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