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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