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Posted to commits@cassandra.apache.org by "Sergey Kuksenko (JIRA)" <ji...@apache.org> on 2019/02/26 22:34:00 UTC
[jira] [Created] (CASSANDRA-15037) cassandra-stress doesn't provide
warmup for duration based executions
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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