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https://issues.apache.org/jira/browse/SOLR-15660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534077#comment-17534077
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Michael Gibney commented on SOLR-15660:
---------------------------------------
More concretely: I think the thread in the randomizedtesting issue you reported
comes from
[here|https://github.com/apache/zookeeper/blob/master/zookeeper-server/src/main/java/org/apache/zookeeper/server/NIOServerCnxnFactory.java#L872-L874],
invoked (with several extra intermediate layers) via JdbcTest's superclass
SolrCloudTestCase.shutdownCluster(). {{expirerThread}} is interrupted (and
promptly exits), but not necessarily before the interrupting thread returns
(and thread leak detection). Unlike the case with {{ZooKeeper.close()}}
([apache/solr#842|https://github.com/apache/solr/pull/842]), there's no
workaround to join() on {{expirerThread}}. So conclusively, ThreadLeakLinger is
indeed the only option.
> Remove universal 10 second test thread leak linger.
> ---------------------------------------------------
>
> Key: SOLR-15660
> URL: https://issues.apache.org/jira/browse/SOLR-15660
> Project: Solr
> Issue Type: Test
> Components: Tests
> Reporter: Mark Robert Miller
> Assignee: Mark Robert Miller
> Priority: Minor
> Fix For: 9.0
>
> Attachments: screenshot-1.png
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
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