Cassandra number of read and write operations in a given time period

Project Notes

To run this Plugin you should first download the check_jmx plugin for Nagios. Since it reads the Values from Check_JMX plugin.

This Plug-in monitors Cassandra number of read and write operations in a given time period, i.e. Read operations per second / write Operations per second.

it fetches WriteOperations or ReadOperations from Nagios JMX plugin and stores the values with timestamp in a log file at /tmp directory, and parses this log file to create the Read/write per second value.

####Sample Log entries###
cat /tmp/Cass_ReadOperations.log
1323353650=JMX CRITICAL ReadOperations=0
1323353710=JMX CRITICAL ReadOperations=120

so the Read per second would be (120-0)/(1323353710-1323353650) i.e 2 per Second.

This take three parameters as input 1) Option i.e. Read operations or write Operations and Warning and Critical Values.

Sample Run.

# ./cass_read_write-rate -h
Usage: ./cass_read_write-rate -o <Option> [-w <WARN>] [-c <CRIT>]
<Option> is which option to perform (ReadOperations | WriteOperations), Default is ReadOperations
<WARN> is Rate/second for WARNing state Default is 5.
<CRIT> is Rate/second for Critical state Default is 10.

# ./cass_read_write-rate -o ReadOperations
Cassandra ReadOperations are 0 per second