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From "Vinay Chella (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-14747) Evaluate 200 node, compression=none, encryption=none, coalescing=off
Date Tue, 06 Nov 2018 20:57:00 GMT


Vinay Chella commented on CASSANDRA-14747:

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|] 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:
>             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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