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#16729: A briefly saturated intra-merge executor can serialize an entire HNSW graph merge
2 hours ago  7 comments  0 votes  0 watches  CH-Abhinav, abernardi597
Description Findings by humans, report and reproductions were AI-assisted (Claude Opus 5). Spinoff from this thread on luceneutil. Summary HnswConcurrentMergeBuilder hands out work through one shared batch counter, so any single ...
    abernardi597 2 hours ago:  Posted a draft PR #16778 to elaborate my thinking, though it slightly departs from my original ...
    CH-Abhinav 1.2 days ago:  any more suggestion you have @abernardi597 ? we can try your idea if you want but i am not sure about it's broader changes in codebase.

#16778 PR: Fix parallelism cap when current thread is enrolled in concurrent HNSW merge
2 hours ago  0 comments  0 votes  0 watches  abernardi597
Closes 16729. Description HnswConcurrentMergeBuilder submitted all of its workers through TaskExecutorinvokeAll ... The intra-merge executor runs a command on the calling thread when it has no spare thread, so when ...

#16774: Change log for 10.5.2 release is giving 404 error
2.6 hours ago  3 comments  0 votes  0 watches  CH-Abhinav, Pulkitg64, mikemccand
The public Lucene releases page returns a 404 for the 10.5.2 changelog: https://lucene.apache.org/ ...
    CH-Abhinav 2.6 hours ago:  Smoker checks website also ? I didn't know that. Also it runs on my phone without 404.
    mikemccand 5.7 hours ago:  I thought smoke tester checked this?

#16674: Can we speed up centroid calculation in the OSQ vector format?
2.6 hours ago  5 comments  0 votes  0 watches  CH-Abhinav, dengfengjiang77, kaivalnp, msokolov
Description In the OSQ based vector format, we recalculate centroids on merge when there are ... If there aren't any deletes, the merged centroid is simply a weighted average of segment-level ... I wonder if we can re-use the information of the previous centroid, even when there are deletes?
    CH-Abhinav 2.7 hours ago:  Also can you experiment on unbiased sampling if possible? I think that can improve performance. Just asking to see if we can trade some accuracy with performance no need to mandatory addition if ...
    dengfengjiang77 3.1 hours ago:  I checked the proposal from @kaivalnp , it does work well from speed level, and we can calculate ... PS : to answer @msokolov question, the whole force merge will take 10-12s, and this change will ...

#16725: Complete FP16 (float16) vector support across Lucene
2.7 hours ago  3 comments  0 votes  0 watches  Pulkitg64, kaivalnp, rcpeken
Description We have been adding FP16 support at various places in Lucene. Listing them below: * Add fp16 (float16) vector encoding support, no quantization support: 16383* ... This is an overview issue which tracks all the task where we need to add the support.
    rcpeken 7 days ago:  Opened 16735 for the Float16VectorSimilarityQuery item. It mirrors FloatVectorSimilarityQuery on top of the fp16 APIs from 16383. One note: I only added the Adaptive variant, since Explicit is deprecated in the float/byte queries ...
    kaivalnp 7.2 days ago:  Thanks @rcpeken, please feel free to open a PR for Float16VectorSimilarityQuery -- I don't think it ...

#16710 PR: Add scalar quantization support for float16 vectors in the dedup KNN Codec
2.7 hours ago  42 comments  0 votes  0 watches  Pranshu-S, github-actions[bot], kaivalnp
Description Addresses one of improvements tracked in 16595 The sandbox dedup KNN codec stores ... Its scalar-quantized variant (DedupScalarQuantizedVectorsFormat) additionally stores a data-blind ... Previously, only FLOAT32 vectors were quantized — FLOAT16 (and BYTE) were stored raw only.
    kaivalnp 5.1 hours ago:  Thanks @Pranshu-S, this PR is looking great! Left some minor nits + code cleanup comments, LGTM overall.
    kaivalnp 5.5 hours ago:  Context leak in comment?

#16622 PR: Propagate getMergeInstance() through the quantized vector readers
3 hours ago  1 comments  0 votes  0 watches  github-actions[bot], jimczi, john-mlika, kaivalnp
MergeState asks every reader for a merge instance when a merge starts, and Lucene99HnswVectorsReader ... For quantized fields the flat reader is Lucene104ScalarQuantizedVectorsReader (or, for older ... Same for finishMerge().
    jimczi 3.2 days ago:  Thanks for this, and sorry it has been sitting. A few things moved under it. 16749 landed, so Lucene99FlatVectorsReader.getMergeInstance() now ... That makes this change more valuable than when you opened it: the gap no longer costs just a read ...

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