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https://issues.apache.org/jira/browse/SOLR-10420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955282#comment-15955282
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Markus Jelsma commented on SOLR-10420:
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Ah, i found it, the problem appeared in 6.1.0. Versions 6.0.0 and 6.0.1 do not
show this problem, the instances are eaten by GC.
> Solr 6.x leaking one SolrZkClient instance per second
> -----------------------------------------------------
>
> Key: SOLR-10420
> URL: https://issues.apache.org/jira/browse/SOLR-10420
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 6.5, 6.4.2
> Reporter: Markus Jelsma
> Fix For: master (7.0), branch_6x
>
>
> One of our nodes became berzerk after a restart, Solr went completely nuts!
> So i opened VisualVM to keep an eye on it and spotted a different problem
> that occurs in all our Solr 6.4.2 and 6.5.0 nodes.
> It appears Solr is leaking one SolrZkClient instance per second via
> DistributedQueue$ChildWatcher. That one per second is quite accurate for all
> nodes, there are about the same amount of instances as there are seconds
> since Solr started. I know VisualVM's instance count includes
> objects-to-be-collected, the instance count does not drop after a forced
> garbed collection round.
> It doesn't matter how many cores or collections the nodes carry or how heavy
> traffic is.
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