[SOLR-11993] LeaderInitiatedRecoveryThread does not retry on UnknownHostException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.5.5, 6.6.2, 7.2
• Fix Version/s: 6.6.3
• Component/s: SolrCloud
• Assignee: Steven Rowe
• Reporter: Shalin Shekhar Mangar
• Created: 14/Feb/18 23:37
• Updated: 08/Jun/19 15:16
• Resolved: 02/Mar/18 03:21

Description

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.