Hi Vigya,

> Should we also revert the default ReadAdvice.RANDOM setting for 10.2.1 
> release? 

I would prefer to not revert this in 10.2.1.  The performance issue is not new 
in 10.2, it was introduced in a prior release. The focus of 10.2.1 is to 
address a couple of severe bugs are new in 10.2.

Separately, we’re working on fixing the underlying issue in 
https://github.com/apache/lucene/issues/14422, which will hopefully make 10.3.

-Chris.

> On 24 Apr 2025, at 17:42, Vigya Sharma <vigya.w...@gmail.com> wrote:
> 
> 
> There are multiple reports (1, 2) of performance regressions after this 
> change. Issue #14408 has good context on the root cause: a patch in Linux 
> kernel stopped counting MADV_RANDOM accesses towards recency in the page 
> cache's LRU active/inactive list. The commit was in kernel 6.3 but some have 
> reported problems with 6.1 as well, (maybe some kernels backported the 
> patch?). I don't think this RC includes the revert yet. 
> 
> On Thu, Apr 24, 2025 at 9:06 AM Chris Hegarty 
> <christopher.hega...@elastic.co.invalid> wrote:
> Please vote for release candidate 1 for Lucene 10.2.1
> 
> The artifacts can be downloaded from:
> https://dist.apache.org/repos/dist/dev/lucene/lucene-10.2.1-RC1-rev-02cf96b8f7c87fdf5eab864bfc242d36aa2086e7
> 
> You can run the smoke tester directly with this command:
> 
> python3 -u dev-tools/scripts/smokeTestRelease.py \
> https://dist.apache.org/repos/dist/dev/lucene/lucene-10.2.1-RC1-rev-02cf96b8f7c87fdf5eab864bfc242d36aa2086e7
> 
> The vote will be open for at least 72 hours (excluding weekends) i.e. until 
> 2025-04-29 17:00 UTC.
> 
> [ ] +1  approve
> [ ] +0  no opinion
> [ ] -1  disapprove (and reason why)
> 
> Here is my +1
> 
> Draft release notes: 
> https://cwiki.apache.org/confluence/display/LUCENE/ReleaseNote10_2_1
> 
> -Chris.
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> 
> 
> -- 
> - Vigya


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