[GitHub] [beam] Abacn commented on issue #27969: [Feature Request]: Support default log level and log level overrides for java direct runner

["Abacn (via GitHub)" <gi...@apache.org>]

Abacn commented on issue #27969:
URL: https://github.com/apache/beam/issues/27969#issuecomment-1679139304

   Tested that simply call `SdkHarnessOptions.getSdkHarnessLogLevelOverrides` won't work on direct runner.
   
   If the java program is using `org.slf4j:slf4j-simple` for console logging, then one could specify the default log level and log level override via the command line option like
   
   ```
   -Dorg.slf4j.simpleLogger.defaultLogLevel=warn \
   -Dorg.slf4j.simpleLogger.log.com.github.yathu.loglevel=debug
   ```
   
   per https://www.slf4j.org/api/org/slf4j/simple/SimpleLogger.html
   
   Or add log configuration file (`simplelogger.properties`) to classpath.
   
   Having a unified way to control logs in direct runner / remote runner is nice to have, however, it looks like configure log levels in run time is not trivial (different slf4j implementation / binding may be used) and Logger.setLevel may not be effective


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