Cao Manh Dat created SOLR-12110:
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Summary: Replica which failed to register in Zk can become leader
Key: SOLR-12110
URL: https://issues.apache.org/jira/browse/SOLR-12110
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 7.3
Reporter: Cao Manh Dat
Assignee: Cao Manh Dat
In case of when an exception is thrown in ZkController.register() a replica can
still be able to joinElection and become leader after that. This will cause
many problems, one of the problems can happen (the patch including a test which
lead to this failure) is
A replica with DOWN state can become a leader and the shard will be stuck in
this state forever until the replica is removed or the node contains the
replica is restarted.
This won't be a problem in Solr 7.2.1 because a replica with last published
state = DOWN can't become a leader, only since SOLR-7034 get resolved (by
SOLR-12011)
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