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https://issues.apache.org/jira/browse/SOLR-8581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851855#comment-15851855
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Walter Underwood commented on SOLR-8581:
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How about a test that covers a rolling version upgrade replacing nodes.
1. Add new live node to cluster.
2. Add replica to new node.
3. Delete replica from old node.
4. Shut down old node.
Probably should run that with commands sent to an old node and a new node.
> 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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