nodetool netstats 

Provides network information about the host.

Provides network information about the host.

Synopsis 

$ nodetool <options> netstats -H
Options
Short Long Description
-h --host Hostname or IP address
-p --port Port number
-pwf --password-file Password file path
-pw --password Password
-u --username User name
-- Separates an option from an argument that could be mistaken for a option.
Other options are:
  • H converts bytes to a human readable form: kilobytes (KB), megabytes (MB), gigabytes (GB), or terabytes (TB). (Cassandra 2.1.1)

Description 

The default host is the connected host if the user does not include a host name or IP address in the command. The output includes the following information:
  • JVM settings
  • Mode

    The possible operational modes for the node are: JOINING, LEAVING, NORMAL, DECOMMISSIONED, CLIENT

  • Read repair statistics
  • Attempted

    The number of successfully completed read repair operations

  • Mismatch (blocking)

    The number of read repair operations since server restart that blocked a query.

  • Mismatch (background)

    The number of read repair operations since server restart performed in the background.

  • Pool name

    Information about client read and write requests by thread pool.

  • Active, pending, and completed number of commands and responses

Example 

Get the network information for a node 10.171.147.128:

$ nodetool -h 10.171.147.128 netstats

The output is:

Mode: NORMAL
Not sending any streams.
Read Repair Statistics:
Attempted: 0
Mismatch (Blocking): 0
Mismatch (Background): 0
Pool Name                    Active   Pending      Completed
Commands                        n/a         0           1156
Responses                       n/a         0           2750