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https://issues.apache.org/jira/browse/SOLR-6336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174541#comment-14174541
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Mark Miller commented on SOLR-6336:
-----------------------------------

Best rule of thumb: if the issue is released, new issue and link it to the 
related one. If it's not released, reopen the issue. 

> DistributedQueue (and it's use in OCP) leaks ZK Watches
> -------------------------------------------------------
>
>                 Key: SOLR-6336
>                 URL: https://issues.apache.org/jira/browse/SOLR-6336
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>            Reporter: Ramkumar Aiyengar
>            Assignee: Mark Miller
>             Fix For: 4.10, Trunk
>
>
> The current {{DistributedQueue}} implementation leaks ZK watches whenever it 
> finds children or times out on finding one. OCP uses this in its event loop 
> and can loop tight in some conditions (when exclusivity checks fail), leading 
> to lots of watches which get triggered together on the next event (could be a 
> while for some activities like shard splitting).
> This gets exposed by SOLR-6261 which spawns a new thread for every parallel 
> watch event.



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