[jira] [Created] (CASSANDRA-12570) high reads on system_auth

["Etienne Adam (JIRA)" <ji...@apache.org>]

Etienne Adam created CASSANDRA-12570:
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             Summary: 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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