Apache Cassandra™ 1.2

Interpreting the output of cassandra-stress

About the period output from the running tests.

Each line reports data for the interval between the last elapsed time and current elapsed time, which is set by the --progress-interval option (default 10 seconds).

7251,725,725,56.1,95.1,191.8,10
19523,1227,1227,41.6,86.1,189.1,21
41348,2182,2182,22.5,75.7,176.0,31
...
Data Description
total Total number of operations since the start of the test.
interval_op_rate Number of operations performed per second during the interval (default 10 seconds).
interval_key_rate Number of keys/rows read or written per second during the interval (normally be the same as interval_op_rate unless doing range slices).
latency Average latency for each operation during that interval.
95th 95% of the time the latency was less than the number displayed in the column (Cassandra 1.2 or later).
99th 99% of the time the latency was less than the number displayed in the column (Cassandra 1.2 or later).
elapsed Number of seconds elapsed since the beginning of the test.
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