nodetool setcachecapacity

Sets global key, row, and counter cache capacities in megabytes.

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

Synopsis

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

UPPERCASE

Literal keyword.

Lowercase

Not literal.

Italics

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.

<datatype1,datatype2>

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

cql_statement;

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.

@xml_entity='xml_entity_type'

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

Definition

The short form and long form parameters 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 user name for authenticating with secure JMX.

Command arguments

counter-cache-capacity

Corresponds to the counter_cache_size_in_mb in cassandra.yaml. By default, the database uses the smaller of minimum of 2.5% of heap or 50 MB.

  • number - the number of keys saved by each cache

  • 0 - disable counter caching

key-cache-capacity

Key cache capacity in MB units.

row-cache-capacity

Row cache capacity in MB units, corresponds to the row_cache_size_in_mb parameter in cassandra.yaml. By default, row caching is zero (disabled).

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