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https://issues.apache.org/jira/browse/CASSANDRA-18541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724990#comment-17724990
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Dinesh Joshi commented on CASSANDRA-18541:
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Can you provide steps to repro the issue? The CPU graphs are not entirely
actionable on their own. If possible you can even capture flame graphs on one
of the Cassandra nodes using the [async
profiler|https://github.com/async-profiler/async-profiler].
> AUTH requests use too much resources
> ------------------------------------
>
> Key: CASSANDRA-18541
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18541
> Project: Cassandra
> Issue Type: Bug
> Reporter: Yury Vidineev
> Priority: Normal
> Attachments: Screenshot_20230520_000633.png,
> Screenshot_20230520_000654.png
>
>
> Hello. I see unexpected CPU usage in a rare situation that may be worth
> digging into.
> We have C* 4.0.9 on Debian running on Java 11.0.18.
> It's a small cluster of 3 nodes on commodity hardware (6 cores CPU, 32 Gb
> RAM, 2 x 512 Gb SSD NVME).
> This ring has about 35 clients using Datastax Java Driver for Apache
> Cassandra.
> In the driver connection settings, we use the following:
> CONNECTION_POOL_LOCAL_SIZE = 400
> CONNECTION_POOL_REMOTE_SIZE = 100
>
> And for some reason, from time to time, it causes hundreds of AUTH requests
> per second that leads to an enormous CPU usage.
> And yes, it's easy not to use these settings in the driver, leaving defaults
> that don't produce such an amount of AUTHs. But isn't it weird that ~150 AUTH
> rps consume ~1200% CPU?
> Please see attached graphs.
> I have the following in the settings:
> authenticator: PasswordAuthenticator
> authorizer: CassandraAuthorizer
> roles_validity_in_ms: 600000
> permissions_validity_in_ms: 600000
> credentials_validity_in_ms: 600000
> Please let me know if I can provide any other necessary information.
> Thanks for your work. Cassandra is amazing :)
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