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#16650 PR: [10.6] Add KnnVectorsReader.getVectorCount to read vector counts from metada…
34 minutes ago  0 comments  0 votes  0 watches  ChrisHegarty, github-actions[bot]
Backport of * #16647

#16631 PR: Vectorize the uint4 nibble unpack via VectorUtilSupport
3.3 hours ago  6 comments  0 votes  0 watches  github-actions[bot], msokolov, neoremind, slow-J
I was looking into HNSW indexing performance and saw in an internal Amazon JFR profiler ... Attempting to improve performance by vectorizing it. Routing it through VectorUtilSupport as int4Unpack so Panama unpacks a register of bytes per ...
    neoremind 3.3 hours ago:  Thanks @slow-J ! The e2e performance gain makes sense given Amdahl's law. I also ran the JMH on a c5.4xlarge with AVX-512, the same finding, bothPacked is slower, and the ...
    slow-J 19.6 hours ago:  Thanks @neoremind , I had a look at JFR earlier, I ran again to share just for the rerank=false. I tried to attach but even compressed they are too large. Created flamegraph via jfrconv --cpu-time -o html will share that instead.

#16515 PR: Apply filter before scoring in MaxScoreBulkScorer
4.8 hours ago  38 comments  0 votes  0 watches  HUSTERGS, HoustonPutman, github-actions[bot], kkewwei, romseygeek
Description Apple filter before scoring in MaxScoreBulkScorer. Resolves 16514 <!-- If this is your first contribution to Lucene, please make sure you have reviewed the ...
    kkewwei 4.8 hours ago:  The applyMask() override in SparseLiveDocs has been implemented in 16593, just ignore the second.
    kkewwei 20.5 hours ago:  @romseygeek Thank you for you review. Could you please help confirm two points? 1.

#16649: Tighten left-bound of MemoryAccountingBitsetCollectorManager.Result#bitSet
15 hours ago  0 comments  0 votes  0 watches  Sasilekha, gaobinlong
DescriptionFollow up to #16452,which tightened the right bound of MemoryAccountingBitsetCollectorMa ... On large indices this is dominant remaining source of overallocation Suggested by @gaobinlong in ( ... Deferred from that PR because it involves a small API shape change to Result rather than a pure bug ...

#16643 PR: Close the reader pool before deleting files on rollback
18.6 hours ago  0 comments  0 votes  0 watches  LuXugang, github-actions[bot], manduinca
Description rollbackInternalNoCommit asks the deleter to remove unreferenced files while the ... On a directory that checks for this the rollback fails outright: ` java.io.IOException: ... That second part turns out to be a lookup answering with an exception where it could answer with ...

#16626: Optimize non-scoring minimum-should-match queries that fall back to WANDScorer
1 day ago  2 comments  0 votes  0 watches  kkewwei
Description BooleanScorerSupplieropt currently selects WANDScorer whenever minShouldMatch > 1`, ... It returns candidate documents through its approximation and performs the actual minimum-should-matc ... Before https://github.com/apache/lucene-solr/pull/2205, query used MinShouldMatchSumScorer, whose ...
    kkewwei 1 day ago:  About the second: MinShouldMatchSumScorer exposes an exact iterator, so it must find a 15-of-16 ... With HighLow, frequency skew creates many rejected candidates and tail advances. This work happens before TopFieldCollector can apply its competitive iterator, so it may validate ...
    kkewwei 4.2 days ago:  I add msm with sort tasks to test MinShouldMatchSumScorer and WANDScorer https://github.com/ ... The only exception is MSM16M15HighLowDaySort. Next, I plan to: 1.

#16644: Incremental doc values increase open file handle count significantly
1 day ago  2 comments  0 votes  0 watches  dweiss, jimczi
Description The changes made in 16418 affect the file handle count significantly. Our handle-limiting guard caught this here: https://ci-builds.apache.org/job/Lucene/job/ ... With the default of 16 overlays, an index with 50 segments and 10 hot doc-values fields could hold ...
    dweiss 1 day ago:  Thanks. Maybe we should lower it to 8.
    jimczi 1.1 days ago:  Yeah I dug into it a bit. The handle count is roughly updated fields times the overlay budget. So it does grow with the number of fields, each one keeps its own stack of generations open.

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