Sergey Kuksenko created CASSANDRA-15037:
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Summary: cassandra-stress doesn't provide warmup for duration
based executions
Key: CASSANDRA-15037
URL: https://issues.apache.org/jira/browse/CASSANDRA-15037
Project: Cassandra
Issue Type: Bug
Components: Legacy/Tools
Reporter: Sergey Kuksenko
Fix For: 4.0.x
Attachments: stress_warmup.patch
cassandra-stress utility performs warmup only when number of operations is
specified.
In case of duration based execution it doesn't provide warmup. That leads to
count startup/warmup induced latency that maybe considered as undesired
statistics.
For example latencies difference between warmed and cold execution even for 15
minutes may reach to: 17% for 99th percentile, 35% for 99.9th and 55% for max
latency.
Attached patch contains example how it may be fixed. It was chosen to use 1/5
of duration time as warmup time, but probably the proper way to do it is to add
a new option.
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