David Smiley created SOLR-17559:
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             Summary: DocCollection should be fully immutable.
                 Key: SOLR-17559
                 URL: https://issues.apache.org/jira/browse/SOLR-17559
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud, SolrJ
            Reporter: David Smiley


DocCollection (a collection's SolrCloud state) has a number of accessors that 
return mutable data structures.  The worst offender is getActiveSlicesArr, 
returning an array.  To reduce the risk of accidental changes, any state 
exposure should be immutable.



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