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https://issues.apache.org/jira/browse/CASSANDRA-6570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868428#comment-13868428
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Jonathan Ellis commented on CASSANDRA-6570:
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Short term, CASSANDRA-6572 looks more reasonable to me.
> Compatibility mode for 2.1
> --------------------------
>
> Key: CASSANDRA-6570
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6570
> Project: Cassandra
> Issue Type: Task
> Components: Core
> Reporter: Jonathan Ellis
>
> Upgrading to a new major Cassandra release is a big commitment, because once
> on a new version you can't downgrade again because we write new-version
> sstables.
> Let's add an option to write old-version sstables so that users can try
> upgrading a single 2.1 RC node in a 2.0 cluster with the safety net of being
> able to back it out if anything goes wrong.
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