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#15508 PR: Use native dot product in Lucene
36.8 minutes ago  42 comments  0 votes  0 watches  dweiss, github-actions[bot], goankur, rmuir, shubhamvishu
Description This is continuation of the work @goankur started in https://github.com/apache/ ... Quoting the comment below from the initial PR.
    shubhamvishu 36.8 minutes ago:  I agree, I'll soon push a version that is least intrusive.
    dweiss 1.2 days ago:  If that's the case then sure - leave the branching - but only in those classes that are dedicated ... The bottom line for me is that if it isn't available (can't be loaded) there should be no change ... It should also make it easier to untagle those implementations, should someone retry my efforts ...

#15704 PR: Migrate linked list to more efficient datastructre
1.5 hours ago  1 comments  0 votes  0 watches  github-actions[bot], renatoh, uschindler
I've replaced almost all LinkedList with an ArrayDeque or an ArrayList. If elements are added/remove at the beginning or at the end, I replaced it with an ArrayDeque. If elements are accessed by index, I removed it with an ArrayList.
    renatoh 3.5 hours ago:  Hi @uschindler I checked every instance of 'new LinkedList' and have replace most of them with ... Please have a look. thanks!

#15662: Lucene nightly benchmark regression on 29/01
4.4 hours ago  44 comments  0 votes  0 watches  benwtrent, epotyom, jpountz, mikemccand, msokolov, rmuir, scampi, shubhamsrkdev, stefanvodita, uschindler
Description We are seeing regressions on lucene nightly benchmarks on 29/01 The set of commits ... We should find the root cause of the regression. Version and environment details_No response_
    rmuir 4.4 hours ago:  > * I hit scary problems -- there were some "malformed" PGP signatures on packages You probably ... When updating packages and you see this one available, it is good to stop what you are doing, ... It will avoid trouble.
    rmuir 5.2 hours ago:  Here is the file used for profiling tests in apache/lucene, where I think this thing was born from ... When profiling the tests, the much lower value makes sense because you asked it explicitly to ...

#15702 PR: Fix Potential NullPointException in BytesRefHash initialization
6.8 hours ago  4 comments  0 votes  0 watches  dweiss, github-actions[bot], mikemccand, tyronecai
Description <!-- If this is your first contribution to Lucene, please make sure you have reviewed the ... https://github.com/apache/lucene/blob/main/CONTRIBUTING.md --> because of variable shadowing, ...
    mikemccand 6.8 hours ago:  Whoa, nice catch, thank you @tyronecai and IntelliJ! I wonder if there is a low-false-positive (high signal to noise ratio) static checker we could turn ... I think it indeed must be that all the BytesStartArrays used here have a non-null bytesUsed?
    tyronecai 9.5 hours ago:  > I wonder why we never hit this NPE... maybe it's just not possible and we should remove the code ... = null? Is it necessary to assume that bytesStartArray.bytesUsed() never null ?

#14214: HNSW connect components can take an inordinate amount of time
8 hours ago  17 comments  0 votes  0 watches  Edarke, Vikasht34, benwtrent, carlosdelest, mikemccand, msokolov, orenovadia, tteofili, txwei, viliam-durina
Description Connect components on Flush or merge, while good for graphs that are "almost OK" but ... I don't readily have test data, but if you have tightly clustered, or many duplicate vectors, it ... It seems to me that since connect Components is a "best effort fix up" of the graph, we should add ...
    mikemccand 8 hours ago:  Is this issue resolved? Were we able to merge those adversarial (index identical vector N times) test cases and they pass? Or we still know of adversarial cases that are not resolved yet?
    benwtrent 10.6 months ago:  > Can we expose a graph construction parameter in Lucene99HnswVectorsFormat to gate the ... This would allow us to mitigate this issue while a more comprehensive fix is developed. I would argue not.

#15676 PR: Feature/collaborative hnsw search
8.4 hours ago  7 comments  0 votes  0 watches  benwtrent, github-actions[bot], krickert, navneet1v
[HNSW] Collaborative Search via Dynamic Threshold Feedback > **Status: Experimental** - This ... Full distributed multi-shard testing will happen in a follow-up PR for OpenSearch.
    krickert 8.4 hours ago:   Distributed Validation Progress: Collaborative HNSW Pruning So testing is now transitioning ... I've discovered that single-host simulations masked a "Coherence Tax" of distributed HNSW search. So testing on real hardware over a LAN is the only way to measure the trade-off between ...
    krickert 2.2 days ago:   Collaborative HNSW Shard Pruning: Visited/Recall Analysis Yup, @benwtrent. The visited/recall curve is the only honest way to judge this. Here is what I am seeing on **1.47M deduped 1024-dim vectors** across **8 independent shards** ( ...

#15703: Review uses of DocValuesRangeIterator
11.3 hours ago  0 comments  0 votes  0 watches  romseygeek
Improper usage of this class triggered a big regression in keyword sorts. We should review other uses of this class in lucene, and see if we can make the class less trappy.

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