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https://issues.apache.org/jira/browse/SOLR-15732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17643107#comment-17643107
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David Smiley commented on SOLR-15732:
-------------------------------------

Updating Aliases and updating collections are independent but both to guard 
against a very similar situation -- what if the ZkStateReader view of the node 
receiving this request is out of date.  Either an alias or a collection might 
exist by this name.

Perhaps updating all collection names is too slow... but it could be done 
similarly to how you tweaked the aliases -- to check the stat/version first.

> queries to missing collection are slow
> --------------------------------------
>
>                 Key: SOLR-15732
>                 URL: https://issues.apache.org/jira/browse/SOLR-15732
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>            Priority: Minor
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Queries to missing collection try to refresh aliases and collection list from 
> ZK and is unnecessarily slow



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