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https://issues.apache.org/jira/browse/SOLR-13386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818172#comment-16818172
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Mark Miller commented on SOLR-13386:
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bq. I'll take a look.
I'm hesitant to change these as part of this fix. It's a similiar pattern, but
also a bit different and maybe not so straightforward to do more
optimistically. It also doesn't continue on any KeeperException, so you should
not hit a bad spin case like in the Overseer.
> Remove race in OverseerTaskQueue#remove that can result in the Overseer
> causing a Zookeeper call spin spike.
> ------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-13386
> URL: https://issues.apache.org/jira/browse/SOLR-13386
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Major
> Fix For: 7.7.2, 8.1
>
>
> If the data call hits NoNodeException, it will throw and the Overseer work
> queue processor will catch it and loop and repeat, which causes major zk
> getData / NoNode call traffic or other such things.
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