Ryan McGuire created CASSANDRA-5896:
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Summary: Stress reports invalid latencies
Key: CASSANDRA-5896
URL: https://issues.apache.org/jira/browse/CASSANDRA-5896
Project: Cassandra
Issue Type: Bug
Components: Tools
Reporter: Ryan McGuire
I get this output from trunk:
{code}
$ ccm node1 stress
total,interval_op_rate,interval_key_rate,latency,95th,99th,elapsed_time
176678,17667,17667,153510.0,1322730.2,181065524.2,10
335566,15888,15888,145371.0,1220290.5,181065524.2,20
498488,16292,16292,145535.0,1227675.0,46032966.9,30
642012,14352,14352,143999.0,1130215.4,46004055.9,40
776083,13407,13407,145573.5,1737871.2,153211818.5,50
1000000,22391,22391,145128.0,1336373.6,148773096.0,60
Averages from the middle 80% of values:
interval_op_rate : 15521
interval_key_rate : 15521
latency median : 146797.7
latency 95th percentile : 1327756.5
latency 99.9th percentile : 121475978.0
Total operation time : 00:01:00
END
{code}
Notice the wild latency values.
Whereas this is the output that I've come to expect (from cassandra-2.0):
{code}
$ ccm node1 stressUnable to create stress keyspace: Keyspace names must be
case-insensitively unique ("Keyspace1" conflicts with "Keyspace1")
total,interval_op_rate,interval_key_rate,latency,95th,99th,elapsed_time
157972,15797,15797,0.1,1.2,119.1,10
346627,18865,18865,0.1,1.2,118.8,20
493937,14731,14731,0.1,1.2,119.2,30
663086,16914,16914,0.2,1.3,119.8,40
893083,22999,22999,0.1,1.1,65.6,50
1000000,10691,10691,0.1,1.1,65.6,55
Averages from the middle 80% of values:
interval_op_rate : 17861
interval_key_rate : 17861
latency median : 0.1
latency 95th percentile : 1.2
latency 99.9th percentile : 108.5
Total operation time : 00:00:55
END
{code}
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