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https://issues.apache.org/jira/browse/CASSANDRA-5511?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640143#comment-13640143
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Marcus Eriksson commented on CASSANDRA-5511:
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does this mean we will support upgrading 1.2 -> 2.1? would be nice if we
required 2.0 as well, to get rid of the deprecated json leveled manifest code
> Clean up backwards compatibility complexity for 2.0
> ---------------------------------------------------
>
> Key: CASSANDRA-5511
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5511
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 2.0
>
>
> We've supported rolling upgrades (network-compatible for read/write
> operations) for several releases, but both 1.0 -> 1.1 and 1.1 -> 1.2 required
> being on a recent release of the immediately prior major series for this to
> work as desired.
> Meanwhile, we still support reading sstables at least back to 0.6 and
> possibly even earlier. This makes dealing with changes to the sstable quite
> challenging; the recently written-and-reverted CASSANDRA-5487 comes to mind.
> 2.0 is a good place to drop support for sstables older than 1.2.5. Our
> experience with network compatibility demonstrates that this is not an
> unreasonable burden to impose, and the major version number change suggests
> that this is a logical time to make such a change.
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