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https://issues.apache.org/jira/browse/CASSANDRA-21589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18107859#comment-18107859
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Dmitry Konstantinov commented on CASSANDRA-21589:
-------------------------------------------------
||Before||After||
|[^21589_before_cpu.html]|[^21589_after_cpu.html]|
|{code:java}
Results:
Op rate : 171,458 op/s
Partition rate : 171,458 pk/s
Row rate : 1,714,576 row/s
Latency mean : 1.7 ms
Latency median : 0.9 ms
Latency 95th percentile : 3.6 ms
Latency 99th percentile : 14.0 ms
Latency 99.9th percentile : 36.0 ms
{code}|{code:java}
Results:
Op rate : 227,686 op/s
Partition rate : 227,686 pk/s
Row rate : 2,276,858 row/s
Latency mean : 1.3 ms
Latency median : 0.8 ms
Latency 95th percentile : 2.4 ms
Latency 99th percentile : 8.9 ms
Latency 99.9th percentile : 28.8 ms{code}|
> isOrdinaryUser check performed by Guardrail.enabled is expensive
> ----------------------------------------------------------------
>
> Key: CASSANDRA-21589
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21589
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/Guardrails
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: 21589_after_cpu.html, 21589_before_cpu.html,
> cpu-heatmap_write.html, image-2026-08-20-16-05-55-487.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We can get like 18% of CPU overhead for this check for a write load if
> authorization is enabled
> [^cpu-heatmap_write.html]
> write test:
> https://issues.apache.org/jira/browse/CASSANDRA-18831?focusedCommentId=18056293&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-18056293
> Guardrails:
> org.apache.cassandra.cql3.RowUpdateBuilder#validateCell -
> columnValueSize/columnTextAndVarcharValueSize
> org.apache.cassandra.cql3.statements.ModificationStatement#validateDiskUsage
> !image-2026-08-20-16-05-55-487.png|width=600!
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