I read every page on druid.io , and forgive me if I forgot, but I didn’t see anywhere that mentions horizontal scalability, except the part regarding redundancy I pasted here - that the other server would pick up if the main one died.
High Availability Characteristics
Druid is designed to have no single point of failure. Different node types are able to fail without impacting the services of the other node types. To run a highly available Druid cluster, you should have at least 2 nodes of every node type running.
If I want my historical node to hold more data - is the only option vertical scaling? i.e. making the instance beefier with more CPU / RAM / SSD
Thanks for any answers,