nodetool invalidatekeycache 

Resets the global key cache parameter to the default, which saves all keys.

Resets the global key cache parameter to the default, which saves all keys.

Synopsis 

$ nodetool <options> invalidatekeycache
Options
Short Long Description
-h --host Hostname or IP address
-p --port Port number
-pwf --password-file Password file path
-pw --password Password
-u --username User name
-- Separates an option from an argument that could be mistaken for a option.

Description 

By default the key_cache_keys_to_save is disabled in the cassandra.yaml. This command resets the parameter to the default.

The location of the cassandra.yaml file depends on the type of installation:
Package installations /etc/cassandra/cassandra.yaml
Tarball installations install_location/resources/cassandra/conf/cassandra.yaml