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https://issues.apache.org/jira/browse/SOLR-8581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851887#comment-15851887
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Walter Underwood commented on SOLR-8581:
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Leader election in a new/old two node cluster. Make sure it can go old->new and
new->old.
> Integration tests for rolling upgrades
> ---------------------------------------
>
> Key: SOLR-8581
> URL: https://issues.apache.org/jira/browse/SOLR-8581
> Project: Solr
> Issue Type: Test
> Reporter: Vivek Narang
>
> I intend to work on an integration test suite for Solr, to test for issues to
> deal with back compat, rolling upgrades etc.
> The interface for the test suite, as I'm planning, would be to have it accept
> two versions of Solr (either released versions or trunk/branch).
> I work on SolrCloud, and we need something like this to enable us to upgrade
> more frequently. I had a conversation with @Ishan Chattopadhyaya, who
> emphasised to me the need to have something like this.
> If there's already any ongoing effort in doing this, I can help out there.
> Please let me know.
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