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Posted to commits@cassandra.apache.org by "Johannes Weißl (Jira)" <ji...@apache.org> on 2021/07/29 19:40:00 UTC
[jira] [Commented] (CASSANDRA-16465) Increased Read Latency With
Cassandra >= 3.11.7
[ 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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