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https://issues.apache.org/jira/browse/SOLR-7989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989798#comment-14989798
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Mark Miller commented on SOLR-7989:
-----------------------------------
I'd still lean toward trying to get that test in, even if just in some nightly
form. I think these specific tests are great. And I'm hoping LIR is not going
to have to change too much. As recovery code hardens, it should actually
continually change less and less is my hope.
Up to you though, I get the current concern with the test. But while the test
is specific, it doesn't seem too terribly complicated. And we are going to want
to add more and more specific tests over time. Perhaps we should do some work
to make a test like this more possible with built in support somehow?
> 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
> 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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