nodetool describecluster

Prints the name, snitch, partitioner and schema version of a cluster.

Typically used to validate the schema after upgrading. If a schema disagreement occurs, check for and resolve schema disagreements.

Synopsis

nodetool [connection_options] describecluster
datacenter_name

Table 1. 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

datacenter_name: The datacenter name.

Example

Get cluster name, snitch, partitioner and schema version

nodetool describecluster

Cluster Information:
                Name: Test Cluster	
                Snitch: com.datastax.bdp.snitch.DseDelegateSnitch
	         DynamicEndPointSnitch: enabled
                Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
                Schema versions:
                	d4f18346-f81f-3786-aed4-40e03558b299: [127.0.0.1]

Get cluster name, snitch, partitioner and schema version

nodetool describecluster

When schema disagreement occurs, the last line of the output includes information about unreachable nodes:

Cluster Information:
                Name: Production Cluster
                Snitch: org.apache.cassandra.locator.DynamicEndpointSnitch
                Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
                Schema versions:
                UNREACHABLE: 1176b7ac-8993-395d-85fd-41b89ef49fbb: [10.202.205.203]