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https://issues.apache.org/jira/browse/SOLR-9869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834238#comment-15834238
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Alan Woodward commented on SOLR-9869:
-------------------------------------

I got a test failure when running this locally:
{code}
[10:20:04.308] ERROR   8.38s J0 | TestMiniSolrCloudCluster.testStopAllStartAll 
<<<
   > Throwable #1: java.lang.ArrayIndexOutOfBoundsException: 4
   >    at 
__randomizedtesting.SeedInfo.seed([3F4B441AB7975037:49755B69F6A0FD18]:0)
   >    at 
java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:387)
   >    at 
java.util.concurrent.CopyOnWriteArrayList.get(CopyOnWriteArrayList.java:396)
   >    at java.util.Collections$UnmodifiableList.get(Collections.java:1309)
   >    at 
org.apache.solr.cloud.TestMiniSolrCloudCluster.testStopAllStartAll(TestMiniSolrCloudCluster.java:345)
{code}
So it looks as though we still need to deal with concurrent removals?

> MiniSolrCloudCluster does not always remove jettys from running list after 
> stopping them
> ----------------------------------------------------------------------------------------
>
>                 Key: SOLR-9869
>                 URL: https://issues.apache.org/jira/browse/SOLR-9869
>             Project: Solr
>          Issue Type: Test
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Tests
>            Reporter: Mike Drob
>            Assignee: Alan Woodward
>         Attachments: SOLR-9869.patch, SOLR-9869.patch
>
>
> MiniSolrCloudCluster has two {{stopJettySolrRunner}} methods that behave 
> differently.
> The {{int}} version calls {{jettys.remove(index);}} to remove the now stopped 
> jetty from the list of running jettys.
> The version that takes a {{JettySolrRunner}}, however, does not modify the 
> running list.
> This can cause calls to {{getReplicaJetty}} to fail after a call to {{stop}} 
> because we will try to get the base url of a stopped jetty.



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