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https://issues.apache.org/jira/browse/CASSANDRA-16465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17292179#comment-17292179
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Sergey Kandyla commented on CASSANDRA-16465:
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Also have an increased read latency after upgrading from 3.11.8 to 3.11.9 (no
issues with 3.11.7 and 3.11.8)
I think it's related to ColumnFilter fix, so posted a detailed explanation here:
https://issues.apache.org/jira/browse/CASSANDRA-15977?focusedCommentId=17279741&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17279741
> 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: 3.11.11
>
>
> 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/[email protected]/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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