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#15807 PR: Replace BigInteger allocation in StringHelper.idToString with HexFormat
45.5 minutes ago  3 comments  0 votes  0 watches  dweiss, github-actions[bot], sgup432
Description While going through PR where we are reducing lock contention, and me further ... HexFormat got available in JDK17+, maybe we can use that now? And is better.
    dweiss 56.8 minutes ago:  Yes, please include it. Maybe we should even target 10x? In this case, put it under changes to 10.5.0.
    sgup432 1.2 hours ago:  @dweiss Do we need a changelog for this change?

#15732 PR: Prevent writing vectors twice during merging HNSW graphs
2 hours ago  9 comments  0 votes  0 watches  benwtrent, github-actions[bot], iverase, mccullocht, msokolov
This PR is just addressing the following suggestion from Adrien when merging https://github.com/ ... This version only supports un-quantised vectors because for quantise vectors the logic is a bit ... The key aspects of this implementation are: 1.- KnnVectorsWritermergeOneField returns now an ...
    iverase 2 hours ago:  @msokolov After some thought, doing the way you suggested requires a change on the semantics of ... This is a big change as it is possible now to change the format of the new segments in an existing ... This will not be possible if we add two methods for merging.
    iverase 5.2 days ago:  In this new iteration I introduced the methods KnnVectorsWriter#mergeFlatVectors and ... The first method is called for all the fields first and after that we call the method ... One important side efect of this work is that we need to make sure that calls to PerFieldKnnVectorsF ...

#15797 PR: Add asserts in PerFieldKnnVectorsFormat
2.2 hours ago  3 comments  0 votes  0 watches  benwtrent, github-actions[bot], iverase
This PR just proves the issue reported in https://github.com/apache/lucene/issues/15796
    iverase 2.2 hours ago:  I am having second thoughts about this change it changes the semantics of PerFieldKnnVectorsFormat ... In the current version we have one call for flush and one call for merge so it is possible to ... This action would not be possible (or at least much more tricky) with this change.
    iverase 7.2 days ago:  Failures were related to a test bug, I think it might still be worthy to add those asserts.

#15814: Should we make Bits implement Accountable
6.5 hours ago  0 comments  0 votes  0 watches  romseygeek
Bits are returned from a few public APIs, notably LeafReader.getLiveDocs(), and can be significant ... Most implementations are actually some form of BitSet, which implements Accountable, and means that ... Should we push this interface down to the base class?

#15722 PR: Add interface to do prefetch on KnnVectorValues and an example implementation to use prefetch in ...
7 hours ago  32 comments  0 votes  0 watches  benwtrent, github-actions[bot], mccullocht, mikemccand, msfroh, navneet1v, vigyasharma
Description This change add the ability to do prefetch for KnnVectorValues. Along with the change, there is a sample implementation of how to add create a PrefetchableFlatVecto ... Places where this prefetch can be useful: 1.
    navneet1v 1.1 days ago:  friendly ping to review the PR: @benwtrent , @mccullocht , @msfroh
    navneet1v 12 days ago:  @msfroh updated the code as per your comments.

#15784 PR: Adaptive graph traversal in similarity-based vector searches
7.1 hours ago  12 comments  0 votes  0 watches  Pulkitg64, benwtrent, github-actions[bot], kaivalnp
Description Lucene added support for similarity-based vector searches in 12679, which is a ... Byte|Float]VectorSimilarityQuery provides an approximate search for this^, which uses a [special ... The search algorithm in upper levels of the HNSW graph is the same as KNN -- which finds the single ...
    benwtrent 7.1 hours ago:  I thought the purpose of traversalSimilarity was to provide a similar interaction to efSearch. It allows you to configure the recall/latency relationship at search time. HNSW graphs are sparse by nature and being able to allow the searcher to explore the graph more to ...
    kaivalnp 2 days ago:  Hi @benwtrent, since you helped review the original similarity-based vector search query (#12679) - ... Thanks in advance!

#15795 PR: Introduce MemoryAccountingBitsetCollectorManager
9.1 hours ago  7 comments  0 votes  0 watches  gaobinlong, github-actions[bot], romseygeek
Description This pr introduces MemoryAccountingBitsetCollectorManager and switches ... Relates to https://github.com/apache/lucene/issues/12892.
    gaobinlong 9.1 hours ago:  I've refactored the code to make it memory efficient for concurrent search case, please take a look ...
    romseygeek 5.4 days ago:  Does this mean we're creating a maxDoc-length FixedBitSet for every thread? I wonder if there's a way of being more memory efficient here?

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