abhishekagarwal87 commented on pull request #11519:
URL: https://github.com/apache/druid/pull/11519#issuecomment-889944909


   > How does that differs from the current use of log.warn(), log.debug(), 
log.trace() etc? You can change the log level for specific class in the log4j 
file already.
   > 
   > Hmm.. actually I can just add an additional log.debug call to log the 
stack exception and remove the flag
   
   are you trying to set log level for a particular query run or for all all 
the queries? Former may be useful when you don't want the logs to be too noisy 
but still get the ability to troubleshoot an individual query. a change in 
log4j setting will apply to all the queries and require a restart of the 
service. 


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