[jira] [Created] (SOLR-14342) CoreSorter is partially broken, thus core loading order is sub-optimal

["David Smiley (Jira)" <ji...@apache.org>]

David Smiley created SOLR-14342:
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             Summary: CoreSorter is partially broken, thus core loading order is sub-optimal
                 Key: SOLR-14342
                 URL: https://issues.apache.org/jira/browse/SOLR-14342
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
            Reporter: David Smiley
            Assignee: David Smiley


In SOLR-7280, it Solr was supposedly improved to load cores in a more optimal order in SolrCloud, considering the state of collections across the cluster.  The CoreContainer uses CoreSorter for this.  Unfortunately, CoreSorter's attempts to gather statistics early on in CoreSorter.init() operate on an empty list and do nothing (i.e. dead code). The root cause is that getCloudDescriptors() works by looking at cc.getCores however at this stage _there are no cores_ ! (We haven't sorted them so they certainly haven't been loaded yet.   I have a fix.

This might be classified as a bug fix but the core load order is more about optimization, so a fix to a wrong/incomplete optimization isn't really a bug from a user's point of view.



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