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https://issues.apache.org/jira/browse/CASSANDRA-12570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15449479#comment-15449479
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Etienne Adam commented on CASSANDRA-12570:
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Thank you for your reply,
It's maybe a little inefficient but it was working fine without the auth, and I
think having such a load due to the auth only is a bit strange. The user was
not a superuser, so it should be a very fast, simple lookup to a tiny local
table which fit in memory... I don't understand how it can increase that much
the load..
> high reads on system_auth
> -------------------------
>
> Key: CASSANDRA-12570
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12570
> Project: Cassandra
> Issue Type: Bug
> Environment: Cluster of 5 nodes, 2.1.15
> Reporter: Etienne Adam
>
> Since we activated authentication on our production cluster today, we're
> seeing high reads on keyspace "system_auth", which is causing a non
> negligeable increase in system load.
> - Reads on system_auth are between 7K to 15K/minutes depending on the node.
> - RF for system_auth was set to 5, we changed it to 3 without any visible
> effect.
> - System loads went from ~1 to ~8
> - Nothing special on the logs (
> We did not find any configuration to fix this, and it seems that
> authentication alone should not cause that kind of a load.. ?
> Is there more information we can provide to help debug this before we turn
> off authentication ?
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