Shalin Shekhar Mangar created SOLR-11993:
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             Summary: LeaderInitiatedRecoveryThread does not retry on 
UnknownHostException
                 Key: SOLR-11993
                 URL: https://issues.apache.org/jira/browse/SOLR-11993
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 6.6.2, 7.2, 5.5.5
            Reporter: Shalin Shekhar Mangar


The LIR thread has a whitelist of exceptions on which it retries. It should 
include UnknownHostException to avoid cases where a flaky DNS server (AWS 
Route53!) can cause replicas to be stuck in "down" state until restarted.



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