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https://issues.apache.org/jira/browse/SOLR-18280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18121165#comment-18121165
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Nick Shanin commented on SOLR-18280:
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🤖 _AI text below_ 🤖

[~epugh]  I checked the recent 10x nightlies while reviewing this issue:
 * [#118|https://ci-builds.apache.org/job/Solr/job/Solr-NightlyTests-10x/118/] 
— {{TestReplicationHandler.testUrlAllowList}} passed
 * [#119|https://ci-builds.apache.org/job/Solr/job/Solr-NightlyTests-10x/119/] 
— build failed before publishing JUnit results
 * [#120|https://ci-builds.apache.org/job/Solr/job/Solr-NightlyTests-10x/120/] 
— {{TestReplicationHandler.testUrlAllowList}} passed

I have a small local test-only patch that separates the direct allow-list 
denial from the leader-to-follower fetch path. Are you still working on this 
ticket, or would you like me to finish validating and share the patch?

> reproducible TestReplicationHandler.testUrlAllowList failures
> -------------------------------------------------------------
>
>                 Key: SOLR-18280
>                 URL: https://issues.apache.org/jira/browse/SOLR-18280
>             Project: Solr
>          Issue Type: Test
>            Reporter: Chris M. Hostetter
>            Assignee: Eric Pugh
>            Priority: Major
>         Attachments: apache_solr_Solr-NightlyTests-10x_1.log.txt.gz, 
> apache_solr_Solr-NightlyTests-10x_2.log.txt.gz, 
> apache_solr_Solr-NightlyTests-10x_4.log.txt.gz
>
>
> jenkins stats show a 75% failure rate from 
> TestReplicationHandler.testUrlAllowList in the past 7 days – all from 10x 
> nightly builds, and all related to seeds that reproduce reliably
> Picking one of the seeds at random, in looking for a "start" point to run bit 
> bisect, I found that the failures are not new - these particular seeds _with 
> *nightly*_ will fail even if you go several months back.
> Ultimately git bisect identified commit SHA 
> {{46479673b836c9364bc3648ceef771fa16b266c6}} (which does not cite a jira) as 
> when these failures were introduced.
> Since {{46479673b8}} only modifies test files, it is likely that these 
> failures only represent a test bug -- but it's possible they represent a 
> "real" bug that our tests only started surfacing after these test changes.



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