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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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