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https://issues.apache.org/jira/browse/SOLR-15565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki resolved SOLR-15565.
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Resolution: Invalid
It turns out this is already the case, ie. when {{collection}} param is used
then only this collection is retrieved from {{ClusterState}}.
> Optimize CLUSTERSTATUS when filtering by collection
> ---------------------------------------------------
>
> Key: SOLR-15565
> URL: https://issues.apache.org/jira/browse/SOLR-15565
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
>
> When user specifies {{collection}} parameter in the {{CLUSTERSTATUS}} command
> one would expect that Solr retrieves and materializes only that collection
> state. Unfortunately, {{ClusterStatus.getClusterStatus}} retrieves the
> complete map, which in turn materializes all collection statuses. On large
> clusters with many large collections this is wasteful.
> In this case, when user requests state information for some collection only,
> we should iterate just on the collection names and materialize only these
> collections' information.
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