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Posted to commits@cassandra.apache.org by "Paulo Motta (Jira)" <ji...@apache.org> on 2021/02/24 17:28:00 UTC
[jira] [Comment Edited] (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=17290118#comment-17290118 ]
Paulo Motta edited comment on CASSANDRA-16465 at 2/24/21, 5:27 PM:
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I'm not very familiar with CASSANDRA-15690, but perhaps we could retain the optimization for sstables without partition deletions if we include additional metadata about the presence of partition deletions ? (cc [~samt], [~aleksey])
was (Author: paulo):
I'm not very familiar with CASSANDRA-15690, but perhaps we could retain the optimization for sstables without partition deletions if we include additional metadata about the presence of partition deletions on ? (cc [~samt], [~aleksey])
> 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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