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https://issues.apache.org/jira/browse/SOLR-10420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973354#comment-15973354
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ASF subversion and git services commented on SOLR-10420:
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Commit 42d08dd28c6609a2c70a691e6a88725c9aa31377 in lucene-solr's branch
refs/heads/branch_5x from [~dragonsinth]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=42d08dd ]
SOLR-10420: fix watcher leak in DistributedQueue
> 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: 5.5.2, 6.4.2, 6.5
> Reporter: Markus Jelsma
> Assignee: Scott Blum
> Fix For: 5.5.5, 5.6, 6.5.1, 6.6, master (7.0)
>
> Attachments: OverseerTest.106.stdout, OverseerTest.119.stdout,
> OverseerTest.80.stdout, OverseerTest.DEBUG.43.stdout,
> OverseerTest.DEBUG.48.stdout, OverseerTest.DEBUG.58.stdout,
> SOLR-10420-dragonsinth.patch, SOLR-10420.patch, SOLR-10420.patch,
> SOLR-10420.patch, SOLR-10420.patch, SOLR-10420.patch
>
>
> 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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