nodetool tablehistograms

Returns troubleshooting and performance metrics for a table during the past 15 minutes. Formerly nodetool cfhistograms. Use this tool to analyze performance, tune individual tables, and ensure the percent latency level meets the Service Level Agreement (SLA) for the data stored in the table.

Table performance statistics include the following metrics:

read/write latency
partition size
cell count
number of SSTables

Synopsis

nodetool [<connection_options>] tablehistograms
[--] <keyspace_name> <table_name>

Tarball path: <installation_location>/resources/cassandra/bin

Definition

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

--: Separates an option from an argument that could be mistaken for an option.

keyspace_name: The keyspace name.

table_name: The table name.

Examples

Get statistics for the events table cycling keyspace:

nodetool tablehistograms cycling events

Results:

cycling/events histograms
Percentile  SSTables     Write Latency      Read Latency    Partition Size        Cell Count
                              (micros)          (micros)           (bytes)
50%             1.00            126.93            654.95              2759                 3
75%             1.00            152.32           1358.10              5722                 3
95%             1.00            785.94           5839.59             17084                 3
98%             1.00           1629.72          12108.97             29521                 3
99%             1.00           2346.80          12108.97             42510                 3
Min             1.00             73.46            219.34               104                 3
Max             1.00           2346.80          12108.97            219342                 3