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https://issues.apache.org/jira/browse/CASSANDRA-16465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17290926#comment-17290926
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Aleksey Yeschenko commented on CASSANDRA-16465:
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[~paulo] Yes, we could easily - whether or not it is the cause of this JIRA.

> 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/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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