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https://issues.apache.org/jira/browse/CASSANDRA-14747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677293#comment-16677293
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Vinay Chella commented on CASSANDRA-14747:
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Thank you [~jasobrown] for the patch on CASSANDRA-14503
[~jolynch] and I benchmarked Jason's 14503-v2 branch, our benchmark results
show [trunk-Jason's
branch|https://github.com/jasobrown/cassandra/tree/14503-v2] is significantly
out-performing 3.0.17 in terms of mean, 99th, and 95th percentile during a pure
write benchmark. When systems are under heavy load, we have seen coordinator
mean latencies are ~14x better, 99th latencies are ~4x better and 95th
latencies are ~6x better on the trunk.
When both trunk and 3.0.17 had 67k write QPS applied, throughput is steady on
the trunk and 3.0.17 fell over. Note that we have only tested writes in this
benchmark. However, the trunk is accumulating more hints than 3.0.17 and
dropping messages compared to 3.0.17, these issues are yet to troubleshoot. For
a detailed analysis of this benchmarking, find attached document [Cassandra 4.0
testing with CASSANDRA-14503 fixes]
> Evaluate 200 node, compression=none, encryption=none, coalescing=off
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-14747
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14747
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Joseph Lynch
> Assignee: Joseph Lynch
> Priority: Major
> Attachments: 3.0.17-QPS.png, 4.0.1-QPS.png,
> 4.0.11-after-jolynch-tweaks.svg, 4.0.12-after-unconditional-flush.svg,
> 4.0.15-after-sndbuf-fix.svg, 4.0.7-before-my-changes.svg,
> 4.0_errors_showing_heap_pressure.txt,
> 4.0_heap_histogram_showing_many_MessageOuts.txt,
> i-0ed2acd2dfacab7c1-after-looping-fixes.svg,
> trunk_14503_v2_cpuflamegraph.svg, trunk_vs_3.0.17_latency_under_load.png,
> ttop_NettyOutbound-Thread_spinning.txt,
> useast1c-i-0e1ddfe8b2f769060-mutation-flame.svg,
> useast1e-i-08635fa1631601538_flamegraph_96node.svg,
> useast1e-i-08635fa1631601538_ttop_netty_outbound_threads_96nodes,
> useast1e-i-08635fa1631601538_uninlinedcpuflamegraph.0_96node_60sec_profile.svg
>
>
> Tracks evaluating a 200 node cluster with all internode settings off (no
> compression, no encryption, no coalescing).
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