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https://issues.apache.org/jira/browse/LUCENE-10647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17564099#comment-17564099
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Vigya Sharma commented on LUCENE-10647:
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I think the cause of this failure is related, but slightly different from
https://issues.apache.org/jira/browse/LUCENE-10617.. However, I'm not able to
repro it on my box despite running the tests on repeat.
My hunch is that we are hitting an exception in the {{addDocument()}} API,
which gets swallowed by the catch block. But, as a result, we end up calling
{{writer.rollback()}} before (or rather without) calling
getMergeScheduler().sync().
Once rollback is triggered, MergeThreads exit with an abort, which is swallowed
(and not rethrown) by {{{}writer.handleMergeExceptions(){}}}. This leaves the
excCalled flag as unset, causing the assertion error.
(Code Ref -
[https://github.com/apache/lucene/blob/main/lucene/core/src/test/org/apache/lucene/TestMergeSchedulerExternal.java#L133-L139)|https://github.com/apache/lucene/blob/main/lucene/core/src/test/org/apache/lucene/TestMergeSchedulerExternal.java#L133-L139]
I can raise a quick PR with a fix But I don't have a good way to test and
confirm as this has not reproed on my box so far.
> Failure in TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler
> --------------------------------------------------------------------------
>
> Key: LUCENE-10647
> URL: https://issues.apache.org/jira/browse/LUCENE-10647
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Vigya Sharma
> Priority: Major
>
> Recent builds are intermittently failing on
> TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler. Example:
> https://jenkins.thetaphi.de/job/Lucene-main-Linux/35576/testReport/junit/org.apache.lucene/TestMergeSchedulerExternal/testSubclassConcurrentMergeScheduler/
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