Jeremy Hanna commented on CASSANDRA-14557:

Does this go beyond CASSANDRA-14303?

> Consider adding default and required keyspace replication options
> -----------------------------------------------------------------
>                 Key: CASSANDRA-14557
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14557
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Configuration
>            Reporter: Sumanth Pasupuleti
>            Assignee: Sumanth Pasupuleti
>            Priority: Minor
>             Fix For: 4.0
> Ending up with a keyspace of RF=1 is unfortunately pretty easy in C* right 
> now - the system_auth table for example is created with RF=1 (to take into 
> account single node setups afaict from CASSANDRA-5112), and a user can 
> further create a keyspace with RF=1 posing availability and streaming risks 
> (e.g. rebuild).
> I propose we add two configuration options in cassandra.yaml:
>  # {{default_keyspace_rf}} (default: 1) - If replication factors are not 
> specified, use this number.
>  # {{required_minimum_keyspace_rf}} (default: unset) - Prevent users from 
> creating a keyspace with an RF less than what is configured
> These settings could further be re-used to:
>  * Provide defaults for new keyspaces created with SimpleStrategy or 
> NetworkTopologyStrategy (CASSANDRA-14303)
>  * Make the automatic token allocation algorithm interface more intuitive 
> allowing easy use of the new token allocation algorithm.
> At the end of the day, if someone really wants to allow RF=1, they simply 
> don’t set the setting. For backwards compatibility the default remains 1 and 
> C* would create with RF=1, and would default to current behavior of allowing 
> any RF on keyspaces.

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