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https://issues.apache.org/jira/browse/CASSANDRA-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17400202#comment-17400202
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Stefan Miklosovic commented on CASSANDRA-14557:
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By the way, I would like to see also a way how to change this in runtime via
JMX. It seems to me rather strict to enable this once in cassandra.yaml and
then it is set in stone since then ... Requirements changes over time in this
regard and inability to change it without restarting a node seems to be quite
much to demand.
> 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: Local/Config
> Reporter: Sumanth Pasupuleti
> Assignee: Sumanth Pasupuleti
> Priority: Low
> Labels: 4.0-feature-freeze-review-requested
> Fix For: 4.x
>
> Attachments: 14557-4.0.txt, 14557-trunk.patch
>
>
> 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|https://issues.apache.org/jira/browse/CASSANDRA-13701?focusedCommentId=16095662&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16095662]
> 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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