[jira] [Created] (SOLR-7989) Down replica elected leader

["Ishan Chattopadhyaya (JIRA)" <ji...@apache.org>]

Ishan Chattopadhyaya created SOLR-7989:
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             Summary: Down replica elected leader
                 Key: SOLR-7989
                 URL: https://issues.apache.org/jira/browse/SOLR-7989
             Project: Solr
          Issue Type: Bug
            Reporter: Ishan Chattopadhyaya
            Priority: Minor


It is possible that a down replica gets elected as a leader, and that it stays down after the election.

Here's how I hit upon this:
* There are 3 replicas: leader, notleader0, notleader1
* Introduced network partition to isolate notleader0, notleader1 from leader (leader puts these two in LIR via zk).
* Kill leader, remove partition. Now leader is dead, and both of notleader0 and notleader1 are down. There is no leader.
* Remove LIR znodes in zk.
* Wait a while, and there happens a (flawed?) leader election.
* Finally, the state is such that one of notleader0 or notleader1 (which were down before) become leader, but stays down.

>From logs, I see that the recovery fails but yet the replica becomes a leader.



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