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https://issues.apache.org/jira/browse/CASSANDRA-16078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17272538#comment-17272538
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Caleb Rackliffe edited comment on CASSANDRA-16078 at 1/27/21, 3:41 AM:
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I ramped up the 6-node tests to something closer to 40% (rather than 5%) CPU
usage, and the story hasn't changed much, if at all. 4.0/trunk is better than
3.x at the 50th, 90th, and 99th percentiles for reads, writes, and deletes.
[~dcapwell] [~brandon.williams] Any objections to closing at this point?
was (Author: maedhroz):
I ramped up the 6-node tests to something closer to 40% (rather than 5%) CPU
usage, and the story hasn't changed much, if at all. 4.0/trunk is better at the
50th, 90th, and 99th percentiles for reads, writes, and deletes.
[~dcapwell] [~brandon.williams] Any objections to closing at this point?
> Performance regression for queries accessing multiple rows
> ----------------------------------------------------------
>
> Key: CASSANDRA-16078
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16078
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: David Capwell
> Assignee: Caleb Rackliffe
> Priority: Normal
> Fix For: 4.0-beta
>
> Attachments: ClusteringSlicing.kt, async-profile-3.0.19-3.svg,
> async-profile-4.0.0-3.svg, image.png, latency_selects_3_4.png
>
>
> This is spin off from CASSANDRA-16036.
> In testing 4.0 relative to 3.0* I found that queries which accessed multiple
> rows to have a noticeable performance decrease; two queries were used in the
> test (more may be impacted, others might not): query partition (table has
> clustering keys) with LIMIT, and query clustering keys using IN clause.
> In the below graphs the green line is 3.0 and the other lines are 4.0 (with
> and without chunk cache)
> Partition with LIMIT
> !https://issues.apache.org/jira/secure/attachment/13009751/clustering-slice_latency_selects_baseline.png!
> !https://issues.apache.org/jira/secure/attachment/13009750/clustering-slice_latency_under90_selects_baseline.png!
> Cluster with IN clause
> !https://issues.apache.org/jira/secure/attachment/13009749/clustering-in-clause_latency_selects_baseline.png!
> !https://issues.apache.org/jira/secure/attachment/13009748/clustering-in-clause_latency_under90_selects_baseline.png!
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