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Posted to dev@lucene.apache.org by "Cao Manh Dat (JIRA)" <ji...@apache.org> on 2018/03/16 23:57:00 UTC
[jira] [Resolved] (SOLR-12110) Replica which failed to register in
Zk can become leader
[ https://issues.apache.org/jira/browse/SOLR-12110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cao Manh Dat resolved SOLR-12110.
---------------------------------
Resolution: Fixed
Fix Version/s: 7.3
> 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
> Fix For: 7.3
>
> 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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