terrymanu commented on issue #24861:
URL: 
https://github.com/apache/shardingsphere/issues/24861#issuecomment-3628165332

   ##  Problem Understanding: 
   
   Issue #24861 reports that on master a593ad9, props.system-log-level (or 
system_log_level) in server.yaml has no effect at startup, and only after 
running DistSQL SET DIST VARIABLE system_log_level = 'DEBUG' do DEBUG logs 
appear.
   
   ##  Root Cause: 
   
   Current master removed the logging-related feature and the system-log-level 
property (see RELEASE-NOTES.md:17 “Remove configuration property key 
system-log-level - #35493”), so this property is no longer supported and is 
ignored in server.yaml.
   
   ##  Analysis: 
   
   In the latest code, system-log-level/system_log_level does not exist (no 
matches in the repo). Log level now follows the logging framework configuration 
(e.g., logback/log4j), not props-driven dynamic control. The prior DistSQL 
dynamic log-level adjustment was removed with the logging module, so 
expectations based on the old behavior no longer apply.
   
   ##  Conclusion: 
   
   This is an outdated usage, not a defect in current master. Please configure 
log levels via the logging framework’s config file. Since the feature was 
removed, the issue can be closed.


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