[jira] [Created] (SOLR-14471) base replica selection strategy not applied to "last place" shards.preference matches

["Michael Gibney (Jira)" <ji...@apache.org>]

Michael Gibney created SOLR-14471:
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             Summary: base replica selection strategy not applied to "last place" shards.preference matches
                 Key: SOLR-14471
                 URL: https://issues.apache.org/jira/browse/SOLR-14471
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 8.3, master (9.0)
            Reporter: Michael Gibney


When {{shards.preferences}} is specified, all inherently equivalent groups of replicas should fall back to being sorted by the {{replica.base}} strategy (either random or some variant of "stable"). This currently works for every group of "equivalent" replicas, with the exception of "last place" matches.

This is easy to overlook, because usually it's the "first place" matches that will be selected for the purpose of actually executing distributed requests; but it's still a bug, and is especially problematic when "last place matches" == "first place matches" – e.g. when {{shards.preference}} specified matches _all_ available replicas.



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