[ 
https://issues.apache.org/jira/browse/SOLR-9846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15873791#comment-15873791
 ] 

Mark Miller commented on SOLR-9846:
-----------------------------------

{noformat}
   [junit4] ERROR   0.00s | StreamExpressionTest (suite) <<<
   [junit4]    > Throwable #1: java.lang.AssertionError: ObjectTracker found 1 
object(s) that were not released!!! [Overseer]
   [junit4]    > 
org.apache.solr.common.util.ObjectReleaseTracker$ObjectTrackerException
   [junit4]    >        at 
org.apache.solr.common.util.ObjectReleaseTracker.track(ObjectReleaseTracker.java:42)
   [junit4]    >        at 
org.apache.solr.cloud.Overseer.start(Overseer.java:523)
   [junit4]    >        at 
org.apache.solr.cloud.OverseerElectionContext.runLeaderProcess(ElectionContext.java:748)
   [junit4]    >        at 
org.apache.solr.cloud.LeaderElector.runIamLeaderProcess(LeaderElector.java:170)
   [junit4]    >        at 
org.apache.solr.cloud.LeaderElector.checkIfIamLeader(LeaderElector.java:135)
   [junit4]    >        at 
org.apache.solr.cloud.LeaderElector.access$200(LeaderElector.java:56)
   [junit4]    >        at 
org.apache.solr.cloud.LeaderElector$ElectionWatcher.process(LeaderElector.java:348)
   [junit4]    >        at 
org.apache.solr.common.cloud.SolrZkClient$3.lambda$process$0(SolrZkClient.java:268)
   [junit4]    >        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   [junit4]    >        at 
java.util.concurrent.FutureTask.run(FutureTask.java:266)
   [junit4]    >        at 
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   [junit4]    >        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   [junit4]    >        at java.lang.Thread.run(Thread.java:745)
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([D0C5E99506097E9D]:0)
   [junit4]    >        at 
org.apache.solr.SolrTestCaseJ4.teardownTestCases(SolrTestCaseJ4.java:301)
   [junit4]    >        at java.lang.Thread.run(Thread.java:745)Throwable #2: 
com.carrotsearch.randomizedtesting.ThreadLeakError: 1 thread leaked from SUITE 
scope at org.apache.solr.client.solrj.io.stream.StreamExpressionTest: 
   [junit4]    >    1) Thread[id=4039, 
name=OverseerHdfsCoreFailoverThread-97477342480957451-127.0.0.1:45975_solr-n_0000000003,
 state=TIMED_WAITING, group=Overseer Hdfs SolrCore Failover Thread.]
   [junit4]    >         at java.lang.Thread.sleep(Native Method)
   [junit4]    >         at 
org.apache.solr.cloud.OverseerAutoReplicaFailoverThread.run(OverseerAutoReplicaFailoverThread.java:139)
   [junit4]    >         at java.lang.Thread.run(Thread.java:745)
{noformat}

> Overseer is not always closed after being started.
> --------------------------------------------------
>
>                 Key: SOLR-9846
>                 URL: https://issues.apache.org/jira/browse/SOLR-9846
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>             Fix For: 6.4, master (7.0)
>
>
> We should interrupt it on close.



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