[CASSANDRA-15160] Add flag to ignore unreplicated keyspaces during repair

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.0.23, 3.11.9, 4.0-beta3, 4.0
• Component/s: Consistency/Repair
• Change Category: Operability
• Complexity: Low Hanging Fruit
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/33bd390c4cec85b9e6407fc1453b203d6b9076bd

Test and Documentation Plan

2 dtests added, https://github.com/krummas/cassandra-dtest/commits/marcuse/15160

• Assignee: Marcus Eriksson
• Reporter: Marcus Eriksson

Authors

Marcus Eriksson

Reviewers

Blake Eggleston, David Capwell

• Created: 14/Jun/19 07:31
• Updated: 03/Jan/21 17:03
• Resolved: 25/Sep/20 04:20

Description

When a repair is triggered on a node in 'dc2' for a keyspace with replication factor

{'dc1':3, 'dc2':0}

we just ignore the repair in versions < 3. In 3.0+ we fail the repair to make sure the operator does not think the keyspace is fully repaired.

There might be tooling that relies on the old behaviour though, so we should add a flag to ignore those unreplicated keyspaces