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https://issues.apache.org/jira/browse/SOLR-11423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16204004#comment-16204004
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Scott Blum commented on SOLR-11423:
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I'm happy to defer on this issue, but I just want to be clear that I actively
dislike having a system property. It feels like a not useful piece of config,
and worse, what happens if you don't set the same cap on every node? Remember
this is enforced client side, not server side. If you accidentally have a mix
of nodes where half of them cap at 20k, and half of them cap at 40k, then the
moment you get above 20k any badly behaving 40k nodes are going to starve out
the 20k nodes. It becomes unfair contention.
> 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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