virajjasani opened a new pull request, #5456:
URL: https://github.com/apache/hadoop/pull/5456

   LogLevel GET API is used to set log level for a given class name 
dynamically. While we have cleaned up the commons-logging references, it would 
be great to determine whether slf4j log4j adapter is in the classpath before 
allowing client to set the log level.
   
   Proposed changes:
   
   - Use slf4j logger factory to get the log reference for the given class name
   - Use generic utility to identify if the slf4j log4j adapter is in the 
classpath before using log4j API to update the log level
   - If the log4j adapter is not in the classpath, report error in the output
   


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