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https://issues.apache.org/jira/browse/CASSANDRA-18312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698445#comment-17698445
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Benedict Elliott Smith commented on CASSANDRA-18312:
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bq. From 5.0 sstable formats before -na- are unsupported.
When did we agree this? This should have a DISCUSS thread.
> Drop support for sstable formats before `na`
> --------------------------------------------
>
> Key: CASSANDRA-18312
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18312
> Project: Cassandra
> Issue Type: Task
> Components: Local/SSTable
> Reporter: Michael Semb Wever
> Assignee: Michael Semb Wever
> Priority: Normal
> Fix For: 5.x
>
>
> From 5.0 sstable formats before {{\-na\-}} are unsupported.
> This patch cleans up code related to the older formats.
> https://github.com/apache/cassandra/compare/trunk...thelastpickle:cassandra:mck/18312/trunk
>
> Raises the question whether backward compatibility to the previous major is
> defined by the Cassandra version or by the internal component version
> (sstable format).
> Also raises the question on whether downstream forks are wanting to support
> such upgrade paths, e.g. offline, and to what versions the {{sstableupgrade}}
> tool supports. This also touches on recent discussions around
> [Downgradability|https://lists.apache.org/thread/tcp339k5ph8ql35wxr085to4qgp8tpg7].
>
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