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https://issues.apache.org/jira/browse/SOLR-17414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17914252#comment-17914252
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Varun Thacker commented on SOLR-17414:
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Just posting here to close the loop.
A user on the lucene user mailing list had reported a vector query bug
[https://lists.apache.org/thread/xn1xg5szxhrs0sbcy4gmx4cvohy6flvh.
|https://lists.apache.org/thread/xn1xg5szxhrs0sbcy4gmx4cvohy6flvh]I have a
local setup where I request `fl=score,sort=id desc` and export 10k rows out of
a knn query and can reproduce this bug
So I started looking into this yesterday and here is my analysis
# The issue reported was introduced in 9.7
# The commit that caused it was
[https://github.com/apache/solr/commit/cfec121bab2ecfc4c06e20a5533596025ae63d98]
# Even though multi-threading is disabled by default, the collector manager
executor changed for single threaded search in that commit. Still very unsure
how that subtle change caused it.
# However the good news is the changes made in this Jira actually fixes the
issues reported by the user.
> multiThreaded=true can result in RejectedExecutionException
> -----------------------------------------------------------
>
> Key: SOLR-17414
> URL: https://issues.apache.org/jira/browse/SOLR-17414
> Project: Solr
> Issue Type: Bug
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.8
>
> Attachments: build-out2.txt
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Since the new multiThreaded search feature landed, I see a new test
> failure involving "RejectedExecutionException" being thrown
> [link|https://ge.apache.org/s/5ack462ji4mlu/tests/task/:solr:core:test/details/org.apache.solr.search.TestRealTimeGet/testStressGetRealtime?top-execution=1].
> It is thrown at a low level in Lucene building TermStates
> concurrently. I doubt the problem is specific to that test
> (TestRealTimeGet) but that test might induce more activity than most
> tests, thus crossing some thresholds like the queue size -- apparently
> 1000.
> *I don't think we should be throwing a RejectedExecutionException
> when running a Search query*
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