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https://issues.apache.org/jira/browse/SOLR-7989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14992163#comment-14992163
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Mark Miller commented on SOLR-7989:
-----------------------------------
I think I was just hitting this pretty consistently while working on a new
ChaosMonkey type test after fixing SOLR-8244.
Had a live and down replica at the end that would never recover. Updated to
this commit and it no longer happens.
> 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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