[CASSANDRA-16747] Block/Warn creating keyspace with RF > Cassandra node count

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.11.13
• Component/s: Cluster/Schema
• Labels: lhf
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/f7009cf3409b005710e8a5c9cae66c3c56de6f66

Test and Documentation Plan

Unittests

• Assignee: Maciej Sokol
• Reporter: Tri Nguyen

Authors

Maciej Sokol

Reviewers

Brandon Williams, Stefan Miklosovic

• Created: 16/Jun/21 13:28
• Updated: 18/Mar/22 15:02
• Resolved: 17/Mar/22 12:10

Description

 

Using Cassandra 3.11.10, 3 nodes cluster Cassandra allows to create a keyspace having `replication_factor` greater than the number of available nodes.

 

-- successfully created Keyspace with RF = 3 > node count = 3

CREATE KEYSPACE mykeyspace WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 5 };

From this discussion on community.datastax.com. It appears that this would lead to serious operational problems.

Would it be OK to improve the `CREATE KEYSPACE` to block (or display warning) when attempting to set `replication_factor` > node count?