The cfs-stress tool

Performs stress testing of the Cassandra File System (CFS) layer.

Usage:

$ cfs-stress [options] cfs_directory

where cfs_directory sets where to store test files.

Note: The tool uses the listen_address defined in the cassandra.yaml. If not using localhost, add the correct IP as an additional argument:

$ stress-cfs [options] cfs_directory listen_address

Options
Short form	Long form	Description
`-d`	`--data-generator class`	Data generator to create files. Available generators: RandomDataGenerator, TextDataGenerator, ZeroDataGenerator. The RandomDataGenerator is a fast pseudo-random data generator that delivers about 1.5 GB of data per second on a single core of Core i7 @ 2.4 GHz.
`-h`	`-help`	Display help.
`-n`	`--count number`	Total number of files read/written. Default: 100.
`-o`	`--operation R\|W\|WR\|WRD`	Operation: `R` read, `W` write, `WR` write and read, `WRD` write and read and delete. Default: `W`
`--r`	`--streams number`	Maximum number of streams kept open per thread. Default 2.
`-s`	`--size number`	Size of each file in KB. Default 1024.
	`--shared-cfs`	Causes all threads to share the same CFS object.
`-t`	`--threads number`	Number of threads. Default 8.

The cfs-stress tool is located in the tools directory:

Installer-Services and Package installations: /usr/share/dse/tools
Installer-No Services and Tarball installations: install_location/dse/tools

Example

From the tools directory:

$ ./cfs-stress cfs_directory

The output looks like:

Writing 104 MB to cfs://localhost:9160/user/pt/cfs_directory in 100 files.
progress       bytes     curr rate      avg rate    max latency
   0.0%       0.0 MB      0.0 MB/s      0.0 MB/s         ------
   0.0%       0.0 MB      0.0 MB/s      0.0 MB/s         ------
   0.0%       0.0 MB      0.0 MB/s      0.0 MB/s         ------
   0.0%       0.0 MB      0.0 MB/s      0.0 MB/s         ------
   0.0%       0.0 MB      0.0 MB/s      0.0 MB/s         ------
  32.0%      33.6 MB      2.6 MB/s      5.5 MB/s     129.554 ms
  80.0%      83.9 MB     31.4 MB/s     11.7 MB/s      10.303 ms
  82.0%      86.0 MB     48.5 MB/s     10.5 MB/s         ------
 100.0%     104.9 MB     14.5 MB/s     12.4 MB/s       0.012 ms

Data	Description
progress	Total progress of the stress operation.
bytes	Total bytes written/read.
curr rate	Current rate of bytes being written/read per second.
avg rate	Average rate of bytes being written/read per second.
max latency	Maximum latency in milliseconds during the current reporting window.