nodetool tablehistograms
Provides statistics about a table that could be used to plot a frequency function.
Provides statistics about a table that could be used to plot a frequency function.
Synopsis
nodetool <options> tablehistograms -- <keyspace> <table>
installation_location/cassandra/bin| 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. |
| keyspace | Name of keyspace. | |
| table | One or more table names, separated by a
space. Note: Either keyspace.table or keyspace
table can be used to designate the table. |
|
-- |
Separates an option from an argument that could be mistaken for a option. | |
Description
The nodetool tablehistograms command provides statistics about a table,
including read/write latency, partition size, column count, and number of SSTables. The
report is incremental, not cumulative. It covers all operations since the last time
nodetool tablehistograms was run in the current session. The use of the
metrics-core library makes the output more informative and easier to understand.
Example
For example, to get statistics about the libout table in the libdata keyspace, use this command:
%CASSANDRA_HOME%/bin/nodetool tablehistograms libdata libout
Output:
libdata/libout histograms
Percentile SSTables Write Latency Read Latency Partition Size Cell Count
(micros) (micros) (bytes)
50% 0.00 39.50 36.00 1597 42
75% 0.00 49.00 55.00 1597 42
95% 0.00 95.00 82.00 8239 258
98% 0.00 126.84 110.42 17084 446
99% 0.00 155.13 123.71 24601 770
Min 0.00 3.00 3.00 1110 36
Max 0.00 50772.00 314.00 126934 3973The output shows the percentile rank of read and write latency values, the partition size, and the cell count for the table.