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https://issues.apache.org/jira/browse/SOLR-11423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203192#comment-16203192
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Cao Manh Dat commented on SOLR-11423:
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[~dragonsinth] Should this ticket be backported to branch_7x?
> Overseer queue needs a hard cap (maximum size) that clients respect
> -------------------------------------------------------------------
>
> Key: SOLR-11423
> URL: https://issues.apache.org/jira/browse/SOLR-11423
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Scott Blum
> Assignee: Scott Blum
>
> When Solr gets into pathological GC thrashing states, it can fill the
> overseer queue with literally thousands and thousands of queued state
> changes. Many of these end up being duplicated up/down state updates. Our
> production cluster has gotten to the 100k queued items level many times, and
> there's nothing useful you can do at this point except manually purge the
> queue in ZK. Recently, it hit 3 million queued items, at which point our
> entire ZK cluster exploded.
> I propose a hard cap. Any client trying to enqueue a item when a queue is
> full would throw an exception. I was thinking maybe 10,000 items would be a
> reasonable limit. Thoughts?
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