nodetool setcachecapacity

Sets global key and row cache capacities in megabytes. A value of 0 means that the cache is disabled.

Overrides the configured value of the row_cache_size_in_mb parameter in cassandra.yaml.

To change the current setting, use nodetool getcachecapacity.


nodetool [<connection_options>] setcachecapacity
[--] <key-cache-capacity> <row-cache-capacity> <counter-cache-capacity>
Syntax conventions Description


Literal keyword.


Not literal.


Variable value. Replace with a valid option or user-defined value.

[ ]

Optional. Square brackets ( [ ] ) surround optional command arguments. Do not type the square brackets.

( )

Group. Parentheses ( ( ) ) identify a group to choose from. Do not type the parentheses.


Or. A vertical bar ( | ) separates alternative elements. Type any one of the elements. Do not type the vertical bar.


Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.

'<Literal string>'

Single quotation ( ' ) marks must surround literal strings in CQL statements. Use single quotation marks to preserve upper case.

{ <key>:<value> }

Map collection. Braces ( { } ) enclose map collections or key value pairs. A colon separates the key and the value.


Set, list, map, or tuple. Angle brackets ( < > ) enclose data types in a set, list, map, or tuple. Separate the data types with a comma.


End CQL statement. A semicolon ( ; ) terminates all CQL statements.

[ -- ]

Separate the command line options from the command arguments with two hyphens ( -- ). This syntax is useful when arguments might be mistaken for command line options.

' <<schema> ... </schema> >'

Search CQL only: Single quotation marks ( ' ) surround an entire XML schema declaration.


Search CQL only: Identify the entity and literal value to overwrite the XML element in the schema and solrconfig files.


The short- and long-form options are comma-separated.

Connection options

-h, --host hostname

The hostname or IP address of a remote node or nodes. When omitted, the default is the local machine.

-p, --port jmx_port

The JMX port number.

-pw, --password jmxpassword

The JMX password for authenticating with secure JMX. If a password is not provided, you are prompted to enter one.

-pwf, --password-file jmx_password_filepath

The filepath to the file that stores JMX authentication credentials.

-u, --username jmx_username

The username for authenticating with secure JMX.

Command arguments


Corresponds to the counter_cache_size_in_mb in cassandra.yaml.

  • number - the number of keys saved by each cache

  • 0 - disable counter caching

Default: Smaller of minimum of 2.5% of heap or 50 MB.


Key cache capacity in MB units.

  • number - the number of MB saved by each cache

  • 0 - disable caching


Row cache capacity in MB units. Corresponds to the row_cache_size_in_mb parameter in cassandra.yaml.

  • number - the number of MB saved by each cache

  • 0 - disable caching

Default: 0 (disabled).


Set the global key to 200 MB, row cache to 50 MB, and counter cache to 25 MB capacities

nodetool setcachecapacity 200 0 25

Ensure capacities were updated.

nodetool getcachecapacity


Key cache capacity: 200 MB
Row cache capacity: 0 MB
Counter cache capacity: 25 MB

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