David Smiley created SOLR-17574:
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             Summary: ClusterState getHostAllowList isn't always updated when 
live nodes change
                 Key: SOLR-17574
                 URL: https://issues.apache.org/jira/browse/SOLR-17574
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 8.8.2
            Reporter: David Smiley


ClusterState.getHostAllowList was introduced in SOLR-15217 to validate a host 
may be reached for distributed-search.  But it's a cached value computed from 
the live nodes, and the live nodes may change.  Thus it can happen that a new 
live node arrives, gets replicas, and suddenly, distributed-search fails with a 
403 ("Forbidden"), with an error string containing this substring: "is neither 
a live node of the cluster nor in the configured".



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