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https://issues.apache.org/jira/browse/CASSANDRA-16465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17331874#comment-17331874
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Ahmed ELJAMI edited comment on CASSANDRA-16465 at 4/26/21, 7:54 AM:
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[~jaid] in our case, regression was observed for the LCS.
The same behaviour as mentioned by [~nvest], SStable reads increases after
upgrading from 3.11.3 to 3.11.9.
[~cscetbon]We have only tested the 3.11.9 but I have refered to [~nvest]'s
mail when I opened a new Jira who have observed the regression even with 3.11.7
was (Author: ahmedeljami):
[~jaid] in our case, regression was observed for the LCS.
The same behaviour as mentioned by [~nvest], SStable reads increases after
upgrading from 3.11.3 to 3.11.9.
[~cscetbon]We have only tested the 3.11.9 but I have refered to [~nvest]
mail's when I opened a new Jira who have observed the regression even with
3.11.7
> 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/[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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