[jira] [Created] (CASSANDRA-6199) Improve Stress Tool

["Benedict (JIRA)" <ji...@apache.org>]

Benedict created CASSANDRA-6199:
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             Summary: Improve Stress Tool
                 Key: CASSANDRA-6199
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6199
             Project: Cassandra
          Issue Type: Improvement
          Components: Tools
            Reporter: Benedict
            Assignee: Benedict
            Priority: Minor


The stress tool could do with sprucing up. The following is a list of essential improvements and things that would be nice to have.

Essential:
- Reduce variability of results, especially start/end tails. Do not trash first/last 10% of readings
- Reduce contention/overhead in stress to increase overall throughput- Short warm-up period, which is ignored for summary (or summarised separately), though prints progress as usual. Potentially automatic detection of rate levelling.
- Per thread Random

Nice to have:
- Calculate and print stdev and mean
- Add batched sequential access mode (where a single thread performs batch-size sequential requests before selecting another random key) to test how key proximity affects performance
- Auto-mode which attempts to establish the maximum throughput rate, by varying the thread count (or otherwise gating the number of parallel requests) for some period, then configures rate limit or thread count to test performance at e.g. 30%, 50%, 70%, 90%, 120%, 150% and unconstrained.
- Auto-mode could have a target variance ratio for mean throughput and/or latency, and completes a test once this target is hit for x intervals


Also, remove the skip-key setting, as it is currently ignored. Unless somebody knows the reason for it.




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