[CASSANDRA-19243] Remove pre-4.0 compatibility code for 5.0

• Type: Improvement
• Status: Triage Needed
• Priority: Normal
• Resolution: Unresolved
• Platform: All
• Assignee: Unassigned
• Reporter: Paulo Motta
• Created: 28/Dec/23 15:40
• Updated: 28/Dec/23 16:15

Description

This is an umbrella ticket to discuss removing pre-4.0 compatibility code from 5.0, similar to CASSANDRA-12716 for 4.x.

A few considerations:

• Discuss/ratify removal of pre-compatibility code on dev mailing list
• What compatibility features are being removed?
• What upgrade tests are being removed ? Are they still relevant and can be reused?
• Should upgrade from 3.x to 5.X fail on startup with an override flag?
• Can/should we make it easier to deprecate/remove compatibility code for future major releases?

Issue Links

• relates to: CASSANDRA-18999 Gossiper::hasMajorVersion3Nodes returns true when a cluster is upgrading patch version without Cassandra 3 nodes.
• relates to: CASSANDRA-12716 Remove pre-3.0 compatibility code for 4.0