Benedict created CASSANDRA-6199:
-----------------------------------
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.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
