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#14334: Incorrect use of fsync
7.8 hours ago  9 comments  0 votes  0 watches  msokolov, rmuir, viliam-durina
Description According to this answer, calling fsync after the file descriptor is closed gives no ... This is exactly what Lucene does: the sync method is on Directory, the implementation opens the ... The sync method, according to this, should have been on IndexOutput, and it should be called before ...
    viliam-durina 7.8 hours ago:  Without fsync, there's no guarantee that anything you wrote was written. The OS delays the writes. If you close, the data is still in memory, the OS later tries to write and fails with an IO error, ...
    rmuir 17.8 hours ago:  absolutely not: this issue has now moved into crazy territory. if you crash, you won't be reading temporary files from before the crash.

#14333 PR: A specialized Trie for Block Tree Index
11.8 hours ago  153 comments  0 votes  0 watches  gf2121, github-actions[bot], jpountz, mikemccand
**Context** * #12631 introduced a MSBVLong format to encode the first fp of FST output. It is the first time we benefit from the output sharing in blocktree. The change reduces ~13% tip size, in turn caused a performance regression when accumulating output ...
    gf2121 11.8 hours ago:  > We should add this format to RandomCodec then, so that it gets included as part of codec ... OK, did not see this. I know how to do it then.
    gf2121 11.8 hours ago:  Thank you very much for all these careful, warm and helpful comments! > Are there any major items / blockers? I think I've addressed all of them (hopefully didn't miss any)

#14094 PR: Add a HNSW collector that exits early when nearest neighbor queue saturates
11.9 hours ago  48 comments  0 votes  0 watches  benwtrent, github-actions[bot], mayya-sharipova, svilen-mihaylov-elastic, tteofili
This introduces a HnswKnnCollector interface, extending KnnCollector for HNSW, to make it possible ... It then adds a new collector which uses a saturation-based threshold to dynamically halt HNSW graph ... The new collector records the number of added neighbors upon exploration of a new candidate (a HNSW ...
    tteofili 13.4 hours ago:  @benwtrent I've reworked the design exposing KnnSearchStrategy#nextVectorsBlock and PatienceKnnVecto ...
    tteofili 18.2 hours ago:  as a first step I've dropped HnswKnnCollector in favor of adding the nextVectorsBlock API to ...

#14267 PR: Reduce the number of comparisons when lowerPoint is equal to upperPoint
12.9 hours ago  9 comments  0 votes  0 watches  github-actions[bot], hanbj, jainankitk, stefanvodita
Description When lowerPoint is equal to upperPoint. In fact, there is no need to compare lowerPoint and upperPoint at the same time. The number of comparisons can be reduced by half when collecting document ids to construct bitsets ...
    jainankitk 12.9 hours ago:  Thanks @hanbj for refactoring the code and adding the unit test. Looks much better now. Just a minor suggestion to improve the readability further.
    jainankitk 12.9 hours ago:  I am assuming we are reusing some of the methods from MultiPointsConstantScoreWeight. That's why we are extending from that class. May, I suggest creating class say PointRangeQueryWeight that extends from ConstantScoreWeight?

#14404 PR: MultiRange query for SortedNumericc DocValues
13 hours ago  2 comments  0 votes  0 watches  github-actions[bot], mkhludnev
Description Extending #13974 idea to SortedNumerics DVs.
    mkhludnev 6.7 days ago:  TODO approach subSet()

#14426 PR: Add support for determining off-heap memory requirements for KnnVectorsReader
13.9 hours ago  20 comments  0 votes  0 watches  ChrisHegarty, benwtrent, github-actions[bot], tteofili
This PR adds support to KnnVectorsReader in order to determine the off-heap memory requirements. The motivation here is to give better insight into the size of off-heap memory that will be needed, ... Somewhat analogous to the existing Accountable interface - which computes the actual in-heap memory ...
    benwtrent 13.9 hours ago:  @ChrisHegarty yeah, I am not sure :(. I think this is a nice first step, but the goal here is to signal the off-heap size so that the ... But, then they need to know how to actually calculate what "enough" is for their typical search ...
    ChrisHegarty 14 hours ago:  I reworded things a bit and added a bit of javadoc to make things clearer.

#14413 PR: Adding profiling support for concurrent segment search
15.3 hours ago  11 comments  0 votes  0 watches  github-actions[bot], jainankitk, jpountz, msfroh
Description This code change introduces AbstractQueryProfilerBreakdown that can be extended by ... -- If this is your first contribution to Lucene, please make sure you have reviewed the ... https://github.com/apache/lucene/blob/main/CONTRIBUTING.md -->
    jpountz 15.3 hours ago:  I'd have a top-level tree for everything related to initializing the search and combining results ( ... Related, it'd be nice if each per-slice object could also tell us about the thread that it ran in ...
    jainankitk 1.3 days ago:  @jpountz - Can you provide your thoughts on above?

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