nodetool proxyhistograms
Provides a histogram of network operation statistics.
Provides a histogram of network operation statistics at the time of the command.
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.
Synopsis
nodetool [connection_options] proxyhistograms
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
This command takes no arguments.
Examples
Get network statistics histogram
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
- CAS Read Latency
- CAS Write Latency
- View Write Latency
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