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https://issues.apache.org/jira/browse/SOLR-10489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969636#comment-15969636
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Erick Erickson commented on SOLR-10489:
---------------------------------------

SOLR-10007 doesn't appear to be the culprit. Steve Rowe generously ran 1,000 
iterations on his beefy machine with SOLR-10007 rolled back and we're seeing 
the same errors. Actually, Steve reports two different ones. The one Andrzej 
reported above and:

{code}
 [junit4]   2> NOTE: reproduce with: ant test  -Dtestcase=StatsReloadRaceTest 
-Dtests.method=testParallelReloadAndStats -Dtests.seed=76D37F1574FC0FE3 
-Dtests.slow=true -Dtests.locale=es-HN 
-Dtests.timezone=America/Indiana/Indianapolis -Dtests.asserts=true 
-Dtests.file.encoding=US-ASCII
   [junit4] ERROR   3.20s | StatsReloadRaceTest.testParallelReloadAndStats <<<
   [junit4]    > Throwable #1: java.lang.NullPointerException
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([76D37F1574FC0FE3:B94D1A2CFB0D67BC]:0)
   [junit4]    >        at 
org.apache.solr.handler.admin.StatsReloadRaceTest.requestMetrics(StatsReloadRaceTest.java:120)
   [junit4]    >        at 
org.apache.solr.handler.admin.StatsReloadRaceTest.testParallelReloadAndStats(StatsReloadRaceTest.java:70)
{code}


[~ab] I'll try to assign it back to you. I doubt that there's a single 
underlying cause so I'll raise a separate JIRA for SolrCloudExampleTest as the 
failures Steve had are significantly different than mine. Unlike the failures 
for this JIRA, the ones for SolrCloudExample test look more likely to be 
related to 10007.

> StatsReloadRaceTest.testParallelReloadAndStats failures
> -------------------------------------------------------
>
>                 Key: SOLR-10489
>                 URL: https://issues.apache.org/jira/browse/SOLR-10489
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: master (7.0)
>            Reporter: Andrzej Bialecki 
>            Assignee: Erick Erickson
>
> This test has been failing a lot after the changes in SOLR-9959, for unclear 
> reasons. The failure is always in the same place:
> {code}
> java.lang.AssertionError: Key SEARCHER.searcher.indexVersion not found in 
> registry solr.core.collection1
>       at 
> __randomizedtesting.SeedInfo.seed([28B54D77FD0E3DF1:E72B284E72FF55AE]:0)
>       at org.junit.Assert.fail(Assert.java:93)
>       at org.junit.Assert.assertTrue(Assert.java:43)
>       at 
> org.apache.solr.handler.admin.StatsReloadRaceTest.requestMetrics(StatsReloadRaceTest.java:132)
>       at 
> org.apache.solr.handler.admin.StatsReloadRaceTest.testParallelReloadAndStats(StatsReloadRaceTest.java:70)
> {code}



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