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https://issues.apache.org/jira/browse/SOLR-13386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16818178#comment-16818178
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Mark Miller commented on SOLR-13386:
------------------------------------

Here is patch that handles NoNodeException and also prevents the Overseer work 
loop from free spinning when it hits an KeeperException.

> 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
>
>         Attachments: SOLR-13386.patch
>
>
> 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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