David Smiley created SOLR-17606:
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             Summary: ClusterStateProvider.collectionStream
                 Key: SOLR-17606
                 URL: https://issues.apache.org/jira/browse/SOLR-17606
             Project: Solr
          Issue Type: Improvement
          Components: SolrCloud, SolrJ
            Reporter: David Smiley


Provide a collectionStream() method to ClusterStateProvider with the same 
semantics as ClusterState.collectionStream.  The point is for Solr users of 
CloudSolrClient (like the Prometheus Exporter) to not refer to ClusterState.  

The work is primarily in the HTTP CSP.  It could have a naive impl that loads 
from ClusterState (fine for most users) but it'd be better to try to _stream_ 
the response directly from Solr somehow so that all the DocCollections aren't 
materialized in memory.



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