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#15613 PR: Add SPANN (Disk Resident HNSW-IVF) Implementation
12.7 minutes ago  23 comments  0 votes  0 watches  atris, github-actions[bot], mccullocht, mikemccand, vigyasharma
Adds Lucene99SpannVectorsFormat, implementing Disk-Resident HNSW-IVF (SPANN) to support vector ... This PR segregatse the index into a Coarse Quantizer (Centroids in HNSW) and the actual Data ( ... Writer flow: Buffers vectors in heap, then runs K-Means++ on flush (using reservoir sampling for ...
    atris 44 minutes ago:  I finished the 16.41M benchmark on 32GB RAM. SPANN R=1 is the lowest‑latency config observed; recall tops out ~0.847 even with higher NProbe. R=2 fails at full scale due to disk exhaustion.
    atris 10 days ago:  > IIUC this doesn't attempt to balance the size of the clusters at all, which is an important ... Yeah, the current optimization relies on weighted reclustering to handle distribution changes, but ... I'd prefer to address that in a follow-up if it becomes a real issue (e.g., by adding a splitting ...

#15620 PR: Add Temporal Merge Policy for time-series data
31.8 minutes ago  36 comments  0 votes  0 watches  benwtrent, churromorales, github-actions[bot], msfroh, shubhamsrkdev
Description This PR introduces TemporalMergePolicy, a new merge policy designed for time-series ... The policy groups segments into time windows and merges segments within the same window, but never ... This preserves temporal locality and improves query performance for time-range queries. relates to ...
    churromorales 31.8 minutes ago:  yeah its n^2 right now, but I was thinking realistically what is the most segments we could have? 50, 100? So I kind of glossed this over, I'll update it to be more efficient.
    shubhamsrkdev 1.9 days ago:  I guess it's fine - since its an advanced knob, I don't mind. If it wasn't, a preset (an enum of say 3 levels?) would have been better, not a concern here though..

#15707: Significant performance impact with new TermOrdValComparator.SkipperBasedCompetitiveState
1.3 hours ago  0 comments  0 votes  0 watches  benwtrent, romseygeek
Description During the 10.4 release process, we noticed a 100-300x slowdown on a benchmark that ... The query is rather innocuous, its an attempt to sort the result by a SORTED SET field while ... The index is sorted by both fields, but also by multiple others.

#15673: Remove obsolete backward codec tests for Lucene 8.x index formats
5.4 hours ago  0 comments  0 votes  0 watches  mayya-sharipova, mikemccand, romseygeek, shubhamsrkdev, stefanvodita, uschindler
The backward-compatible codec impersonators (*RWCodec classes) in lucene/backward-codecs exist ... Since Lucene supports MIN_SUPPORTED_MAJOR - 1, Lucene 8.x indices are no longer readable in Lucene ... Maintaining this test infrastructure creates an ongoing maintenance burden, as evidenced by PR ...

#15683 PR: Reuse reader's fieldInfos
6 hours ago  0 comments  0 votes  0 watches  github-actions[bot], viliam-durina
If an IndexWriter is opened using an IndexCommit with an opened reader (through IndexWriteConfig.set ... This in unnecessary, as their contents are already loaded by the reader, and we can reuse this ... This PR modifies the getFieldNumberMap() method to reuse this information.

#15548: ToParentBlockJoinSortField does not handle missing values correctly
9.4 hours ago  2 comments  0 votes  0 watches  ML-dev-crypto, gmarouli, romseygeek
Description I realised that as part of 15483 I'd made it impossible to set a missing value on ... This showed pretty quickly that the missing value functionality here doesn't really work in the way ... The idea of this sort field is that you query parent documents, but order them by the 'best' value ...
    gmarouli 9.4 hours ago:  I would also like to give it a try, I will take a look coming week, @ML-dev-crypto if you have ...
    ML-dev-crypto 28.1 days ago:  I would like to work on this. I plan to update ToParentBlockJoinSortField to ensure the missingValue is properly propagated down ... This will allow the missing value logic to apply to children before aggregation, rather than just ...

#15705: DirectoryTaxonomyReader#getBulkPath doesn't use cache
11 hours ago  0 comments  0 votes  0 watches  epotyom
Description The method calls getPathFromCache but doesn't use the cached results. Instead, it sorts and reads all values from the index and updates the cache for all of them. I think we should fix this behavior.

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