nodetool setcachecapacity
Set global key and row cache capacities in megabytes.
Set global key and row cache capacities in megabytes.
Synopsis
nodetool <options> setcachecapacity -- <key-cache-capacity> <row-cache-capacity>
Cassandra tarball installations:
installation_location/cassandra/bin| Short | Long | Description |
|---|---|---|
-h |
--host |
Hostname or IP address. |
-p |
--port |
Port number. |
-pwf |
--password-file |
Password file path. |
-pw |
--password |
Password. |
-u |
--username |
Remote JMX agent username. |
| key-cache-capacity | Maximum size in MB of the key cache in memory. | |
| row-cache-capacity | Maximum size in MB of the row cache in memory. | |
| counter-cache-capacity | Maximum size in MB of the counter cache in memory. | |
-- |
Separates an option from an argument that could be mistaken for a option. | |
Description
The key-cache-capacity argument corresponds to the key_cache_size_in_mb parameter in the cassandra.yaml. Each key cache hit saves one seek and each row cache hit saves a minimum of two seeks. Devoting some memory to the key cache is usually a good tradeoff considering the positive effect on the response time. The default value is empty, which means a minimum of five percent of the heap in MB or 100 MB.The row-cache-capacity argument corresponds to the row_cache_size_in_mb parameter in the cassandra.yaml. By default, row caching is zero (disabled).
The counter-cache-capacity argument corresponds to the counter_cache_size_in_mb in the cassandra.yaml. By default, counter caching is a minimum of 2.5% of Heap or 50MB.
The location of the cassandra.yaml file depends on the type of installation:
| Cassandra package installations | /etc/cassandra/cassandra.yaml |
| Cassandra tarball installations | install_location/cassandra/conf/cassandra.yaml |