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https://issues.apache.org/jira/browse/SOLR-12110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16402059#comment-16402059
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Cao Manh Dat commented on SOLR-12110:
-------------------------------------
Updated patch with reliable test ( beasted 100 times )
> 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
> Priority: Blocker
> Attachments: SOLR-12110.patch, SOLR-12110.patch
>
>
> 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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