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https://issues.apache.org/jira/browse/SOLR-6336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14174519#comment-14174519
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Jessica Cheng Mallet commented on SOLR-6336:
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Thanks for the clarification [~elyograg]! I'll open a new issue. Thanks!
> 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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