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https://issues.apache.org/jira/browse/CASSANDRA-15588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17218429#comment-17218429
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Josh McKenzie commented on CASSANDRA-15588:
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We settled on the following recommended and supported paths on the dev list:
# 2.1 -> 3.11 -> 4.0
# 3.0 -> 4.0
# 3.11 -> 4.0
One group was going to take on the 3.0 -> 4.0 path and the other the 2.1 ->
3.11 -> 4.0
We need to better articulate what test coverage we consider sufficient for
confidence in these upgrade paths.
> 4.0 quality testing: Cluster Upgrade
> ------------------------------------
>
> Key: CASSANDRA-15588
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15588
> Project: Cassandra
> Issue Type: Task
> Components: Test/dtest/java, Test/dtest/python
> Reporter: Josh McKenzie
> Priority: Normal
> Fix For: 4.0-beta
>
>
> We've historically had numerous bugs concerning upgrading clusters from one
> version to the other. Let's establish the supported upgrade path and ensure
> that users can safely perform the upgrades in production.
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