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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14747) Evaluate 200 node, compression=none, encryption=none, coalescing=off
Date Thu, 04 Oct 2018 12:45:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638181#comment-16638181
] 

Jason Brown commented on CASSANDRA-14747:
-----------------------------------------

Excellent find, [~jolynch].

Looks like we added the ability to set the send/recv buffer size in CASSANDRA-3378 (which
apparently I reviewed, 5.5 years ago). Looks like in 3.11 we [set the SO_SNDBUF|https://github.com/apache/cassandra/blob/cassandra-3.11/src/java/org/apache/cassandra/net/OutboundTcpConnection.java#L444]
if the operator provided a value in the yaml, but we did not set a default value. However,
it does appear I added a hard-coded default in 4.0 with CASSANDRA-8457. As it's been nearly
two years since I wrote that part of the patch, I have no recollection of why I added a default.
Removing it is trivial and has huge benefits, as  has proven. I'm working on combining the
findings [~jolynch] and I have discovered over the last weeks and should have a patch ready
in a few days (which will probably be part CASSANDRA-14503, as most of this work was based
on that work-in-progress).


> 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_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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