Yury Vidineev created CASSANDRA-18541:
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Summary: 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
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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