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From Johannes Weißl (Jira) <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-16465) Increased Read Latency With Cassandra >= 3.11.7
Date Thu, 29 Jul 2021 19:40:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-16465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390116#comment-17390116
] 

Johannes Weißl commented on CASSANDRA-16465:
--------------------------------------------

[~nvest] now that Cassandra 4.0 is out, it would be very interesting for me if you still have
worse performance than 3.11.6 ...?

> 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, image-2021-04-28-02-11-27-298.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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