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Posted to commits@cassandra.apache.org by "Ekaterina Dimitrova (Jira)" <ji...@apache.org> on 2020/11/10 15:10:00 UTC
[jira] [Assigned] (CASSANDRA-16078) Performance regression for
queries accessing multiple rows
[ https://issues.apache.org/jira/browse/CASSANDRA-16078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ekaterina Dimitrova reassigned CASSANDRA-16078:
-----------------------------------------------
Assignee: Ekaterina Dimitrova
> Performance regression for queries accessing multiple rows
> ----------------------------------------------------------
>
> Key: CASSANDRA-16078
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16078
> Project: Cassandra
> Issue Type: Bug
> Components: Consistency/Coordination
> Reporter: David Capwell
> Assignee: Ekaterina Dimitrova
> Priority: Normal
> Fix For: 4.0-beta
>
> Attachments: image.png
>
>
> This is spin off from CASSANDRA-16036.
> In testing 4.0 relative to 3.0* I found that queries which accessed multiple rows to have a noticeable performance decrease; two queries were used in the test (more may be impacted, others might not): query partition (table has clustering keys) with LIMIT, and query clustering keys using IN clause.
> In the below graphs the green line is 3.0 and the other lines are 4.0 (with and without chunk cache)
> Partition with LIMIT
> !https://issues.apache.org/jira/secure/attachment/13009751/clustering-slice_latency_selects_baseline.png!
> !https://issues.apache.org/jira/secure/attachment/13009750/clustering-slice_latency_under90_selects_baseline.png!
> Cluster with IN clause
> !https://issues.apache.org/jira/secure/attachment/13009749/clustering-in-clause_latency_selects_baseline.png!
> !https://issues.apache.org/jira/secure/attachment/13009748/clustering-in-clause_latency_under90_selects_baseline.png!
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