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From "Aleksei Zotov (Jira)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14557) Consider adding default and required keyspace replication options
Date Tue, 31 Aug 2021 12:22:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407290#comment-17407290
] 

Aleksei Zotov commented on CASSANDRA-14557:
-------------------------------------------

[~sumanth.pasupuleti]
 Thank you! I'm sorry for being scrupulous, but I put a few more comments to [https://github.com/sumanth-pasupuleti/cassandra/commit/5deffedf07186f0af5f5dcf7436bc3a459ed6b42].

> 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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