`nodetool proxyhistograms`

Provides a histogram of network statistics at the time of the command.

Synopsis

nodetool <options> proxyhistograms

Tarball and Installer No-Services path:

<installation_location>/resources/cassandra/bin

Connection 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`	Remote JMX agent username.
`--`	Separates an option from an argument that could be mistaken for an option.

The output of this command shows the full request latency recorded by the coordinator. The output includes the percentile rank of read and write latency values for inter-node communication. Typically, you use the command to see if requests encounter a slow node.

Examples

This example shows the output from nodetool proxyhistograms after running 4,500 insert statements and 45,000 select statements on a three ccm node-cluster on a local computer.

 $ nodetool proxyhistograms

proxy histograms
Percentile      Read Latency     Write Latency     Range Latency
                    (micros)          (micros)          (micros)
50%                  1502.50            375.00            446.00
75%                  1714.75            420.00            498.00
95%                 31210.25            507.00            800.20
98%                 36365.00            577.36            948.40
99%                 36365.00            740.60           1024.39
Min                   616.00            230.00            311.00
Max                 36365.00          55726.00          59247.00

In DataStax Enterprise 5.1, three metrics have been added to the output:

CAS Read Latency
CAS Write Latency
View Write Latency

CAS Read and Write Latency provides data for compare-and-set operations, while View Write Latency provides data for materialized view write operations. The results are slightly different from previous versions:

proxy histograms
Percentile       Read Latency      Write Latency      Range Latency   CAS Read Latency  CAS Write Latency View Write Latency
                     (micros)           (micros)           (micros)           (micros)           (micros)           (micros)
50%                    454.83             379.02            1955.67               0.00               0.00               0.00
75%                   1358.10             943.13            4055.27               0.00               0.00               0.00
95%                   3379.39           12108.97           20924.30               0.00               0.00               0.00
98%                   7007.51          155469.30           89970.66               0.00               0.00               0.00
99%                   8409.01          155469.30          155469.30               0.00               0.00               0.00
Min                     73.46             126.94             126.94               0.00               0.00               0.00
Max                  14530.76          155469.30          155469.30               0.00               0.00               0.00

`nodetool proxyhistograms`

Synopsis

Description

Examples

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