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https://issues.apache.org/jira/browse/CASSANDRA-16465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17332621#comment-17332621
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Jai Bheemsen Rao Dhanwada commented on CASSANDRA-16465:
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Thank you [~nvest] [~AhmedElJAMI]
I tried upgrading from 3.11.6 to 3.11.9 and didn't see any perf drop with my
application use-case and also the cassandra-stress too. I use LCS in all my
tables (system* tables uses default shipped with Cassandra). Do you mind
sharing your test scenarios where you see latency, so I can make sure I am not
missing anything.
[~nvest] please share your finding with 3.11.10 as well, so it will be useful
for me to assess which version to upgrade.
> Increased Read Latency With Cassandra >= 3.11.7
> -----------------------------------------------
>
> Key: CASSANDRA-16465
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16465
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Local Write-Read Paths
> Reporter: Ahmed ELJAMI
> Priority: Normal
> Fix For: 3.11.x, 4.0.x
>
> Attachments: Screenshot from 2021-04-24 20-50-47.png
>
>
> After upgrading Cassandra from 3.11.3 to 3.11.9, Cassandra read latency 99%
> increased significantly. Getting back to 3.11.3 immediately fixed the issue.
> I have observed "SStable reads" increases after upgrading to 3.11.9.
> The same behavior was observed by some other users:
> [https://www.mail-archive.com/user@cassandra.apache.org/msg61247.html]
> According to Paulo Motta's comment, this behavior may be caused by
> https://issues.apache.org/jira/browse/CASSANDRA-15690 which was introduced on
> 3.11.7 and removed an optimization that may cause a correctness issue when
> there are partition deletions.
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