nodetool ring

Returns node status and information about the ring as determined by the node being queried. This information provides an idea of the load balance and if any nodes are down. If the cluster is not properly configured, different nodes may show a different ring. Ensure the node appears the same way in the ring.

  • Address

    The URL of the node.

  • DC

    The datacenter containing the node.

  • Rack

    The rack or, in the case of Amazon EC2, the availability zone of the node.

  • Status - Up or Down

    Indicates whether the node is functioning or not.

  • State - Normal, Leaving, Joining, or Moving

    The state of the node in relation to the cluster.

  • Load

    The amount of file system data in the data directory, excluding the snapshots subdirectories. Because all SSTable data files are included, any data that is not cleaned up, such as TTL-expired cell or tombstoned data, is counted. Updates every 90 seconds.

  • Token

    The end of the token range up to and including the value listed. For an explanation of token ranges, see Data distribution overview.

  • Owns

    The percentage of the data owned by the node per datacenter times the replication factor. For example, a node can own 33% of the ring, but show 100% if the replication factor is 3.

  • Host ID

    The network ID of the node.

Synopsis

nodetool [<connection_options>] ring
[-r] [--] [<keyspace>]
Syntax legend
Syntax conventions Description

Italic, bold, or < >

Syntax diagrams and code samples use one or more of these styles to mark placeholders for variable values. Replace placeholders with a valid option or your own user-defined value.

In CQL statements, angle brackets are required to enclose data types in a set, list, map, or tuple. Separate the data types with a comma. For example: <datatype2

In Search CQL statements, angle brackets are used to identify the entity and literal value to overwrite the XML element in the schema and solrconfig files, such as @<xml_entity>='<xml_entity_type>'.

[ ]

Square brackets surround optional command arguments. Do not type the square brackets.

( )

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

|

A pipe separates alternative elements. Type any one of the elements. Do not type the pipe.

...

Indicates that you can repeat the syntax element as often as required.

'

Single quotation marks must surround literal strings in CQL statements. Use single quotation marks to preserve upper case. + For Search CQL only: Single quotation marks surround an entire XML schema declaration, such as '<<schema> ... </schema>>'

{ }

Map collection. Curly braces enclose maps ({ <key_datatype>:<value_datatype> }) or key value pairs ({ <key>:<value> }). A colon separates the key and the value.

;

Ends a CQL statement.

--

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

Options

If an option has a short and long form, both forms are given, separated by a comma.

-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.

keyspace_name

The keyspace name.

-r, --resolve-ip

Node domain names instead of IPs.

Examples

Get cluster status on all keyspaces:

nodetool ring

Results:

Datacenter: datacenter1
=======================
Address        Rack        Status State   Load            Owns                Token
                                                                              0
127.0.0.1      rack1       Up     Normal  119.67 KiB      100.00%             -9223372036854775808
127.0.0.2      rack1       Up     Normal  124.56 KiB      100.00%             0

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