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https://issues.apache.org/jira/browse/SOLR-16036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17495082#comment-17495082
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Mike Drob commented on SOLR-16036:
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[~ab] - I'm not 100% confident in my changes in the PR, can you take a look? I
saw that in SOLR-11235 you added some checks for if the core is open or closed,
but that might not cover what happens after the core is unregistered.
> Race condition in SolrJmxReporterTest.testClosedCore
> ----------------------------------------------------
>
> Key: SOLR-16036
> URL: https://issues.apache.org/jira/browse/SOLR-16036
> Project: Solr
> Issue Type: Test
> Components: JMX, Tests
> Reporter: Mike Drob
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> [https://jenkins.thetaphi.de/view/Solr/job/Solr-main-MacOSX/666/testReport/org.apache.solr.metrics.reporters/SolrJmxReporterTest/testClosedCore/]
>
> There's a race condition in our test where the core can be unloaded, causing
> the MBean to deregister before the loop has been instructed to stop checking.
> It doesn't reproduce for me at all locally, so I can't verify this, but
> that's my best guess from visual inspection.
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