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https://issues.apache.org/jira/browse/SOLR-14418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Smiley closed SOLR-14418.
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> MetricsHistoryHandler: don't query .system collection
> -----------------------------------------------------
>
>                 Key: SOLR-14418
>                 URL: https://issues.apache.org/jira/browse/SOLR-14418
>             Project: Solr
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: David Smiley
>            Priority: Minor
>
> The MetricsHistoryHandler queries the .system collection on startup with a 
> match-all-docs query just to see that it exists.  I think we should do this 
> without actually issuing a query, like use ClusterState.  Ideally 
> SolrClient.getCollections(regexp) would exist but alas.  In CloudSolrClient, 
> it'd work via cluster state.  No query needed!
> It's death by a thousand cuts in our Solr tests.  In tests, I wish Solr 
> features like this were opt-in.



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