Sumanth Pasupuleti created CASSANDRA-14557:
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Summary: 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
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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