SharedDataCNconf

Before starting CNs, add the following configuration items in the CN configuration file cn.conf:

starlet_port = <starlet_port>
storage_root_path = <storage_root_path>

starlet_port

The CN heartbeat service port for the StarRocks shared-data cluster. Default value: 9070.

storage_root_path

The storage volume directory that the local cached data depends on. Multiple volumes are separated by semicolon (;). Example: /data1;/data2.

The default value for storage_root_path is ${STARROCKS_HOME}/storage.

Local cache is effective when queries are frequent and the data being queried is recent, but there are cases that you may wish to turn off the local cache completely.

• In a Kubernetes environment with CN pods that scale up and down in number on demand, the pods may not have storage volumes attached.
• When the data being queried is in a data lake in remote storage and most of it is archive (old) data. If the queries are infrequent the data cache will have a low hit ratio and the benefit may not be worth having the cache.

To turn off the data cache set:

storage_root_path =

NOTE

The data is cached under the directory <storage_root_path>/starlet_cache.