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#15558 PR: Refactor QueryCache to improve performance
3.1 hours ago  20 comments  0 votes  0 watches  BaurzhanSakhariev, benwtrent, github-actions[bot], mergify[bot], msfroh, sgup432
Description Related issue - https://github.com/apache/lucene/issues/14222 Major changes: ... With each partition having its own read/write lock to improve concurrency.
    msfroh 2.7 days ago:  IMO, this change is pretty good as implemented. While I'm slightly nervous about the implications of modifying the query cache implementation, I ... For those of us who do want a query cache, I think this one should perform much better in ...
    github-actions[bot] 4.3 days ago:  This PR has not had activity in the past 2 weeks, labeling it as stale. If the PR is waiting for review, notify the dev@lucene.apache.org list. Thank you for your contribution!

#15947 PR: Optimize GroupFacetCollector.getFacetEntries()
1.3 days ago  1 comments  0 votes  0 watches  dweiss, gaobinlong, github-actions[bot]
Description The method GroupFacetCollector.getFacetEntries() can be optimized by: 1) Initial ...
    dweiss 1.5 days ago:  In all honesty, I think the previous version was easier to understand and the gain is probably ...

#15952 PR: Add afterMerge() lifecycle hook to KnnVectorsWriter and PerFieldKnnVe…
1.3 days ago  1 comments  0 votes  0 watches  MrFlap, github-actions[bot], navneet1v, shatejas
Resolves https://github.com/apache/lucene/issues/15935 Problem PerFieldKnnVectorsFormat ... This makes it impossible to cleanly release per-merge resources, leading to resource leaks. Solution Add a protected void afterMerge() throws IOException method with a no-op default to both ...
    navneet1v 1.3 days ago:  @MrFlap can you add entry in change log and also unit test for the new interface

#15951 PR: Fix WindowsFS onClose race condition
2 days ago  6 comments  0 votes  0 watches  github-actions[bot], rmuir, szybia
- If i create an InputStream on a target file, and then close it, if i concurrently (before onClose ... = null) { logger.info("Race reproduced: ", e); } } ` ` [2026-04- ...
    szybia 2.7 days ago:  thank you! i don't have write access so leaving up to you to merge 🚀
    rmuir 2.7 days ago:  10.5 is good, i'll backport it. I don't know if there will be a 10.4.1, but if someone wants to make one we could then cherry-pick ...

#15926: The build/test tool ProfileResults that aggregates JFRs and prints the hot stacks doesn't work with ...
2.5 days ago  4 comments  0 votes  0 watches  mikemccand, rmuir
Java 25 added a new CPUTime profiler which uses Linux kernel APIs to sample threads every N CPU ... This eliminates silly ghosts like threads listening forever on a socket. It sounds really cool.
    mikemccand 2.5 days ago:  Thanks @rmuir. I think we should start with just supporting CPUTime profiler (fixing isIntersting() to accept ... After that, we can switch Lucene's tests profiler (CodeProfilingPlugin.java) to use CPUTime ...
    rmuir 9.8 days ago:  good find, I think you are correct: we should be able to switch to this new event, and remove the ... I think isInteresting() was born to try to workaround the problem solved here, otherwise the gradle ...

#15950 PR: Add JMH benchmark comparing various sort algorithms specifically for sorting ScoreDoc[] of varying ...
2.5 days ago  1 comments  0 votes  0 watches  gsmiller, mikemccand, zihanx
[Spinoff from @zihanx's recent PR (15803) adding ReaderUtil.partitionByLeaf helper to collate any ... TL;DR: see this cool benchmark results UI testing various algorithms to sort ScoreDoc[] (smaller is ... The hits from a Lucene query (ScoreDoc[]) come out sorted by something important to the user (e.g. ...
    gsmiller 2.5 days ago:  Oh fun! I took a look through the jmh benchmark itself and left a couple questions but nothing major. I haven't looked at the other two scripts yet.

#15938 PR: Use binary search partitioning in ReaderUtil#partitionByLeaf
2.8 days ago  6 comments  0 votes  0 watches  github-actions[bot], gsmiller, jainankitk, mikemccand
Description This change modifies the "partition" step of ReaderUtilpartitionByLeaf to leverage ... . * Current Implementation: Iterates a sorted list of docIDs, checking each against leaf/segment ...
    mikemccand 2.8 days ago:  I love it -- it's also a nice code simplification since we no longer need the additional / ... Thanks @gsmiller. I also made a fun little JMH benchmark with CC (Claude Code) ... will try to open PR soon.
    mikemccand 2.8 days ago:  Maybe assert count > 0 since we think we're always handling/optimizing the empty case above?

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