Non-coordinator services produce excessive logging from druid-basic-security extension

[dave-mccowan]

Affected Version

Detected in master, but has occured since PR#8692

Description

Issue occurs when using druid-basic-security extension and having an authenticator in the authenticator chain that has no users setup (not even the admin and druid_system internal users). This includes the LDAP authenticator that does not store users in teh metadata table.

The issue is the follow log message is emitted every minute by every process when the default pollingPeriod of 1 minute is used.

2024-07-20T12:43:56,374 INFO [BasicAuthenticatorCacheManager-Exec--0] org.apache.druid.security.basic.authentication.db.cache.CoordinatorPollingBasicAuthenticatorCacheManager - Empty cached serialized user map retrieved, authenticator - ldap

This log message was added in PR#8692. Before an exception was caught every minute. Now a log message is emitted every minute. This is excessive and should not occur in this normal and frequent condition.

[dave-mccowan]

I will submit a PR to address this. I propose changing the INFO level log to DEBUG level.