[jira] [Created] (SOLR-12166) Race condition in rejoinElection and registering replica

["Cao Manh Dat (JIRA)" <ji...@apache.org>]

Cao Manh Dat created SOLR-12166:
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             Summary: Race condition in rejoinElection and registering replica
                 Key: SOLR-12166
                 URL: https://issues.apache.org/jira/browse/SOLR-12166
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Cao Manh Dat
            Assignee: Cao Manh Dat


I found this case when beasting LIROnShardRestartTest, the case here is
 * ReplicaA may be the new leader - try and sync with other replicas and somehow failed to become the leader (ex: LIR flag).
 * ReplicaA call rejoinElection, therefore, starting the recovery process
 * After rejoinElection, it somehow wins the election (ex: all replicas participated in the election, therefore LIR flag is cleared).
 * ReplicaA register itself as ACTIVE after winning the election
 * The recovery process above publish ReplicaA to DOWN or RECOVERY
 * We end up with a dead-end shard with a DOWN leader, hence other replicas can't do recovery with replicaA



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