How to disable experimental features on already running cluster

ScyllaDB
1

I have a 5.2.9 cluster running. Currently in the scylla config I have the following experimental features enabled:

experimental_features:
  - alternator-ttl
  - alternator-streams

How can I disable these features on my cluster? I have tried removing them from scylla.yml and restart the service but the node will not join the cluster anymore with following error:
(Feature 'ALTERNATOR_STREAMS' was previously enabled in the cluster but its support is disabled by this node. Set the corresponding configuration option to enable the support for the feature.)

2

Enabling Alternator Streams means that the feature flag bit is set in gossip, so you can’t disable it any longer.

But this shouldn’t be a problem, as you simply can avoid using it by not having any Alternator tables with Streams enabled. Just keep the ball rolling, or re-create the cluster with the feature disabled.

Unrelated, yet worth to mention anyway: Alternator TTL is production ready on 5.2, so you no longer have to enable it manually on scylla.yaml