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Posted to dev@lucene.apache.org by "Noble Paul (JIRA)" <ji...@apache.org> on 2015/11/05 15:20:27 UTC
[jira] [Resolved] (SOLR-7989) Down replica elected leader, stays
down after successful election
[ https://issues.apache.org/jira/browse/SOLR-7989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Noble Paul resolved SOLR-7989.
------------------------------
Resolution: Fixed
Fix Version/s: Trunk
5.4
> Down replica elected leader, stays down after successful election
> -----------------------------------------------------------------
>
> Key: SOLR-7989
> URL: https://issues.apache.org/jira/browse/SOLR-7989
> Project: Solr
> Issue Type: Bug
> Reporter: Ishan Chattopadhyaya
> Assignee: Noble Paul
> Fix For: 5.4, Trunk
>
> Attachments: DownLeaderTest.java, DownLeaderTest.java, SOLR-7989.patch, SOLR-7989.patch, SOLR-7989.patch, SOLR-7989.patch, SOLR-8233.patch
>
>
> 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.
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