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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